imx6: kernel: add UBI_BLOCK support

UBI_BLOCK support is needed for mounting squashfs over UBI

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

SVN-Revision: 47507

target/linux/imx6/config-4.1

@@ -241,7 +241,7 @@ CONFIG_MTD_NAND_GPMI_NAND=y
 # CONFIG_MTD_PHYSMAP_OF is not set
 CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_BEB_LIMIT=20
-# CONFIG_MTD_UBI_BLOCK is not set
+CONFIG_MTD_UBI_BLOCK=y
 # CONFIG_MTD_UBI_FASTMAP is not set
 # CONFIG_MTD_UBI_GLUEBI is not set
 CONFIG_MTD_UBI_WL_THRESHOLD=4096