Convert CONFIG_CMD_ETHSW to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_ETHSW

Also enable it for sandbox to increase build coverage.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/T1040D4RDB_NAND_defconfig b/configs/T1040D4RDB_NAND_defconfig
index bf239bd..c22bf9c 100644
--- a/configs/T1040D4RDB_NAND_defconfig
+++ b/configs/T1040D4RDB_NAND_defconfig
@@ -28,6 +28,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_FSL_CAAM=y
diff --git a/configs/T1040D4RDB_SDCARD_defconfig b/configs/T1040D4RDB_SDCARD_defconfig
index e6a5b83..63010c5 100644
--- a/configs/T1040D4RDB_SDCARD_defconfig
+++ b/configs/T1040D4RDB_SDCARD_defconfig
@@ -28,6 +28,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_FSL_CAAM=y
diff --git a/configs/T1040D4RDB_SECURE_BOOT_defconfig b/configs/T1040D4RDB_SECURE_BOOT_defconfig
index b0edffa..4758257 100644
--- a/configs/T1040D4RDB_SECURE_BOOT_defconfig
+++ b/configs/T1040D4RDB_SECURE_BOOT_defconfig
@@ -20,6 +20,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_DM=y
diff --git a/configs/T1040D4RDB_SPIFLASH_defconfig b/configs/T1040D4RDB_SPIFLASH_defconfig
index e99809b..2a872b9 100644
--- a/configs/T1040D4RDB_SPIFLASH_defconfig
+++ b/configs/T1040D4RDB_SPIFLASH_defconfig
@@ -29,6 +29,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_FSL_CAAM=y
diff --git a/configs/T1040D4RDB_defconfig b/configs/T1040D4RDB_defconfig
index 355d6ab..82d6140 100644
--- a/configs/T1040D4RDB_defconfig
+++ b/configs/T1040D4RDB_defconfig
@@ -18,6 +18,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_FSL_CAAM=y
diff --git a/configs/T1040QDS_DDR4_defconfig b/configs/T1040QDS_DDR4_defconfig
index 6ebde4d..063ae20 100644
--- a/configs/T1040QDS_DDR4_defconfig
+++ b/configs/T1040QDS_DDR4_defconfig
@@ -20,6 +20,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_BMP=y
 CONFIG_CMD_DATE=y
 CONFIG_CMD_EXT2=y
diff --git a/configs/T1040QDS_SECURE_BOOT_defconfig b/configs/T1040QDS_SECURE_BOOT_defconfig
index e437cda..a75ee03 100644
--- a/configs/T1040QDS_SECURE_BOOT_defconfig
+++ b/configs/T1040QDS_SECURE_BOOT_defconfig
@@ -22,6 +22,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_BMP=y
 CONFIG_CMD_DATE=y
 CONFIG_CMD_EXT2=y
diff --git a/configs/T1040QDS_defconfig b/configs/T1040QDS_defconfig
index 7b96193..5d8cdf1 100644
--- a/configs/T1040QDS_defconfig
+++ b/configs/T1040QDS_defconfig
@@ -20,6 +20,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_BMP=y
 CONFIG_CMD_DATE=y
 CONFIG_CMD_EXT2=y
diff --git a/configs/T1040RDB_NAND_defconfig b/configs/T1040RDB_NAND_defconfig
index a427cf1..b3e9c41 100644
--- a/configs/T1040RDB_NAND_defconfig
+++ b/configs/T1040RDB_NAND_defconfig
@@ -28,6 +28,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_FSL_CAAM=y
diff --git a/configs/T1040RDB_SDCARD_defconfig b/configs/T1040RDB_SDCARD_defconfig
index 2d2585f..7b2187c 100644
--- a/configs/T1040RDB_SDCARD_defconfig
+++ b/configs/T1040RDB_SDCARD_defconfig
@@ -28,6 +28,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_FSL_CAAM=y
diff --git a/configs/T1040RDB_SECURE_BOOT_defconfig b/configs/T1040RDB_SECURE_BOOT_defconfig
index c15f600..f16834b 100644
--- a/configs/T1040RDB_SECURE_BOOT_defconfig
+++ b/configs/T1040RDB_SECURE_BOOT_defconfig
@@ -20,6 +20,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_DM=y
diff --git a/configs/T1040RDB_SPIFLASH_defconfig b/configs/T1040RDB_SPIFLASH_defconfig
index f0c6000..9f5a8c4 100644
--- a/configs/T1040RDB_SPIFLASH_defconfig
+++ b/configs/T1040RDB_SPIFLASH_defconfig
@@ -29,6 +29,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_FSL_CAAM=y
diff --git a/configs/T1040RDB_defconfig b/configs/T1040RDB_defconfig
index 1fca4a4..7d6ed1b 100644
--- a/configs/T1040RDB_defconfig
+++ b/configs/T1040RDB_defconfig
@@ -18,6 +18,7 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_ETHSW=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_FSL_CAAM=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 9e46fa6..3b136e8 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -184,5 +184,6 @@
 CONFIG_UT_TIME=y
 CONFIG_UT_DM=y
 CONFIG_UT_ENV=y
+CONFIG_CMD_ETHSW=y
 CONFIG_WDT=y
 CONFIG_WDT_SANDBOX=y