Convert CONFIG_BOOTM_NETBSD to Kconfig

This converts the following to Kconfig:
   CONFIG_BOOTM_NETBSD

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/deneb_defconfig b/configs/deneb_defconfig
index 5377b4f..c0e7725 100644
--- a/configs/deneb_defconfig
+++ b/configs/deneb_defconfig
@@ -37,6 +37,7 @@
 CONFIG_AUTOBOOT_STOP_STR="\x1b\x1b"
 CONFIG_AUTOBOOT_KEYED_CTRLC=y
 CONFIG_CMD_CPU=y
+# CONFIG_BOOTM_NETBSD is not set
 # CONFIG_CMD_EXPORTENV is not set
 # CONFIG_CMD_IMPORTENV is not set
 # CONFIG_CMD_CRC32 is not set
diff --git a/configs/giedi_defconfig b/configs/giedi_defconfig
index dfac924..d2b0f13 100644
--- a/configs/giedi_defconfig
+++ b/configs/giedi_defconfig
@@ -37,6 +37,7 @@
 CONFIG_AUTOBOOT_STOP_STR="\x1b\x1b"
 CONFIG_AUTOBOOT_KEYED_CTRLC=y
 CONFIG_CMD_CPU=y
+# CONFIG_BOOTM_NETBSD is not set
 # CONFIG_CMD_EXPORTENV is not set
 # CONFIG_CMD_IMPORTENV is not set
 # CONFIG_CMD_CRC32 is not set
diff --git a/configs/imx8qm_rom7720_a1_4G_defconfig b/configs/imx8qm_rom7720_a1_4G_defconfig
index 305c4e8..8af2b23 100644
--- a/configs/imx8qm_rom7720_a1_4G_defconfig
+++ b/configs/imx8qm_rom7720_a1_4G_defconfig
@@ -27,6 +27,7 @@
 CONFIG_SPL_WATCHDOG_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_CPU=y
+# CONFIG_BOOTM_NETBSD is not set
 # CONFIG_CMD_IMPORTENV is not set
 CONFIG_CMD_CLK=y
 CONFIG_CMD_DM=y
diff --git a/include/configs/capricorn-common.h b/include/configs/capricorn-common.h
index b107e0c..38a56e8 100644
--- a/include/configs/capricorn-common.h
+++ b/include/configs/capricorn-common.h
@@ -42,10 +42,6 @@
 
 #define CONFIG_REMAKE_ELF
 
-/* Commands */
-
-#undef CONFIG_BOOTM_NETBSD
-
 /* ENET Config */
 #define CONFIG_FEC_XCV_TYPE		RMII
 #define FEC_QUIRK_ENET_MAC
diff --git a/include/configs/imx8qm_rom7720.h b/include/configs/imx8qm_rom7720.h
index 9808e72..5621ba8 100644
--- a/include/configs/imx8qm_rom7720.h
+++ b/include/configs/imx8qm_rom7720.h
@@ -15,8 +15,6 @@
 #define CONFIG_SPL_BSS_START_ADDR	0x00128000
 #define CONFIG_SPL_BSS_MAX_SIZE	0x1000  /* 4 KB */
 
-#undef CONFIG_BOOTM_NETBSD
-
 #define CONFIG_FSL_USDHC
 #define CONFIG_SYS_BOOTMAPSZ		(256 << 20)
 #define CONFIG_SYS_FSL_ESDHC_ADDR	0