DM: DM_MMC migration is now mandatory for non-SPL

As it has been now two years past the migration deadline, it is required
to have migrated.  Remove the check from the Makefile and rework some of
the Kconfig logic slightly to get the functional dependencies of DM_MMC
/ BLK right in both the SPL and non-SPL case.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1043ardb_sdcard_SECURE_BOOT_defconfig b/configs/ls1043ardb_sdcard_SECURE_BOOT_defconfig
index 06c1ce5..1f6087c 100644
--- a/configs/ls1043ardb_sdcard_SECURE_BOOT_defconfig
+++ b/configs/ls1043ardb_sdcard_SECURE_BOOT_defconfig
@@ -49,7 +49,9 @@
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM=y
 CONFIG_SPL_DM=y
+# CONFIG_SPL_BLK is not set
 CONFIG_DM_I2C=y
+# CONFIG_SPL_DM_MMC is not set
 CONFIG_FSL_ESDHC=y
 CONFIG_MTD=y
 CONFIG_MTD_NOR_FLASH=y