arm: omap2: am43xx: Enable CONFIG_BLK

With DM_MMC enabled, enable CONFIG_BLK to remove this
compile warning for am43xx based targets:

===================== WARNING ======================
This board does not use CONFIG_DM_MMC. Please update
the board to use CONFIG_DM_MMC before the v2019.04 release.
Failure to update by the deadline may result in board removal.
See doc/driver-model/MIGRATION.txt for more info.
====================================================

Targets were compile tested, build was clean.

Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>

configs/am43xx_evm_defconfig

@@ -37,7 +37,7 @@ CONFIG_REGMAP=y
 CONFIG_SPL_REGMAP=y
 CONFIG_SYSCON=y
 CONFIG_SPL_SYSCON=y
-# CONFIG_BLK is not set
+CONFIG_BLK=y
 CONFIG_DFU_MMC=y
 CONFIG_DFU_RAM=y
 CONFIG_DFU_SF=y

configs/am43xx_evm_qspiboot_defconfig

@@ -34,7 +34,7 @@ CONFIG_MULTI_DTB_FIT=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 CONFIG_DM=y
-# CONFIG_BLK is not set
+CONFIG_BLK=y
 CONFIG_DFU_MMC=y
 CONFIG_DFU_RAM=y
 CONFIG_DFU_SF=y

configs/am43xx_evm_rtconly_defconfig

@@ -29,7 +29,7 @@ CONFIG_DEFAULT_DEVICE_TREE="am437x-gp-evm"
 CONFIG_OF_LIST="am437x-gp-evm am437x-sk-evm am43x-epos-evm am437x-idk-evm"
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 CONFIG_DM=y
-# CONFIG_BLK is not set
+CONFIG_BLK=y
 CONFIG_DFU_MMC=y
 CONFIG_DFU_RAM=y
 CONFIG_DFU_SF=y

configs/am43xx_evm_usbhost_boot_defconfig

@@ -41,7 +41,7 @@ CONFIG_OF_LIST="am437x-gp-evm am437x-sk-evm am43x-epos-evm am437x-idk-evm"
 CONFIG_ENV_IS_IN_FAT=y
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 CONFIG_DM=y
-# CONFIG_BLK is not set
+CONFIG_BLK=y
 CONFIG_DFU_MMC=y
 CONFIG_DFU_RAM=y
 CONFIG_DFU_SF=y

configs/am43xx_hs_evm_defconfig

@@ -40,7 +40,7 @@ CONFIG_DEFAULT_DEVICE_TREE="am437x-gp-evm"
 CONFIG_OF_LIST="am437x-gp-evm am437x-sk-evm am43x-epos-evm am437x-idk-evm"
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 CONFIG_DM=y
-# CONFIG_BLK is not set
+CONFIG_BLK=y
 CONFIG_DFU_MMC=y
 CONFIG_DFU_RAM=y
 CONFIG_DFU_SF=y