mips: pic32mzdask: enable CONFIG_BLK

CONFIG_BLK needs to be enabled by default to allow U-Boot to
compile after a 'make pic32mzdask_defconfig'.
Signed-off-by: NJohn Robertson <john.robertson@simiatec.com>

configs/pic32mzdask_defconfig

@@ -27,7 +27,6 @@ CONFIG_CMD_EXT4_WRITE=y
 # CONFIG_EFI_PARTITION is not set
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_NET_RANDOM_ETHADDR=y
-# CONFIG_BLK is not set
 CONFIG_CLK=y
 CONFIG_MMC=y
 CONFIG_DM_MMC=y