Convert CONFIG_CMD_MMC to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_MMC

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/bcm7260_defconfig b/configs/bcm7260_defconfig
index afb59ec..d467e62 100644
--- a/configs/bcm7260_defconfig
+++ b/configs/bcm7260_defconfig
@@ -13,6 +13,7 @@
 CONFIG_PREBOOT="fdt addr ${fdtcontroladdr};fdt move ${fdtcontroladdr} ${fdtsaveaddr};fdt addr ${fdtsaveaddr};"
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot>"
+CONFIG_CMD_MMC=y
 CONFIG_EFI_PARTITION=y
 CONFIG_OF_PRIOR_STAGE=y
 CONFIG_ENV_IS_IN_MMC=y
diff --git a/configs/bcm7445_defconfig b/configs/bcm7445_defconfig
index 0ae0595..2c71a5e 100644
--- a/configs/bcm7445_defconfig
+++ b/configs/bcm7445_defconfig
@@ -14,6 +14,7 @@
 CONFIG_PREBOOT="fdt addr ${fdtcontroladdr};fdt move ${fdtcontroladdr} ${fdtsaveaddr};fdt addr ${fdtsaveaddr};"
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot>"
+CONFIG_CMD_MMC=y
 CONFIG_CMD_SF_TEST=y
 CONFIG_CMD_SPI=y
 CONFIG_OF_PRIOR_STAGE=y
diff --git a/configs/gurnard_defconfig b/configs/gurnard_defconfig
index a5d51ce..7e394d9 100644
--- a/configs/gurnard_defconfig
+++ b/configs/gurnard_defconfig
@@ -16,6 +16,7 @@
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_GPIO=y
 # CONFIG_CMD_LOADS is not set
+CONFIG_CMD_MMC=y
 CONFIG_CMD_NAND=y
 CONFIG_CMD_PART=y
 CONFIG_CMD_USB=y
diff --git a/configs/imx8mq_evk_defconfig b/configs/imx8mq_evk_defconfig
index 1504ecb..7472bad 100644
--- a/configs/imx8mq_evk_defconfig
+++ b/configs/imx8mq_evk_defconfig
@@ -19,6 +19,7 @@
 # CONFIG_BOOTM_NETBSD is not set
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_REGULATOR=y
 CONFIG_CMD_EXT2=y
diff --git a/configs/imx8mq_phanbell_defconfig b/configs/imx8mq_phanbell_defconfig
index 651940c..045d204 100644
--- a/configs/imx8mq_phanbell_defconfig
+++ b/configs/imx8mq_phanbell_defconfig
@@ -21,6 +21,7 @@
 # CONFIG_BOOTM_NETBSD is not set
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_REGULATOR=y
 CONFIG_CMD_EXT2=y
diff --git a/configs/ls1021aiot_qspi_defconfig b/configs/ls1021aiot_qspi_defconfig
index dba33e2..cb73a04 100644
--- a/configs/ls1021aiot_qspi_defconfig
+++ b/configs/ls1021aiot_qspi_defconfig
@@ -12,6 +12,7 @@
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_GPT=y
+CONFIG_CMD_MMC=y
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_EXT2=y
diff --git a/configs/ls1021aiot_sdcard_defconfig b/configs/ls1021aiot_sdcard_defconfig
index fc6df70..10b6930 100644
--- a/configs/ls1021aiot_sdcard_defconfig
+++ b/configs/ls1021aiot_sdcard_defconfig
@@ -17,6 +17,7 @@
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0xe8
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_GPT=y
+CONFIG_CMD_MMC=y
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_EXT2=y
diff --git a/configs/pico-imx8mq_defconfig b/configs/pico-imx8mq_defconfig
index 2d68fe1..470fd3a 100644
--- a/configs/pico-imx8mq_defconfig
+++ b/configs/pico-imx8mq_defconfig
@@ -19,6 +19,7 @@
 # CONFIG_BOOTM_NETBSD is not set
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_REGULATOR=y
 CONFIG_CMD_EXT2=y
diff --git a/configs/s32v234evb_defconfig b/configs/s32v234evb_defconfig
index 99720a9..78450c2 100644
--- a/configs/s32v234evb_defconfig
+++ b/configs/s32v234evb_defconfig
@@ -13,6 +13,7 @@
 CONFIG_CMD_MEMTEST=y
 CONFIG_SYS_MEMTEST_START=0xc0000000
 CONFIG_SYS_MEMTEST_END=0xc7c00000
+CONFIG_CMD_MMC=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM=y