imx6: disable ext2/ext3 filesystem support (ext4 is enough)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 47032

target/linux/imx6/config-3.18

@@ -108,14 +108,6 @@ CONFIG_DTC=y
 # CONFIG_DW_DMAC_CORE is not set
 # CONFIG_DW_DMAC_PCI is not set
 # CONFIG_EMAC_ROCKCHIP is not set
-CONFIG_EXT2_FS=y
-CONFIG_EXT2_FS_POSIX_ACL=y
-CONFIG_EXT2_FS_SECURITY=y
-CONFIG_EXT2_FS_XATTR=y
-CONFIG_EXT3_FS=y
-CONFIG_EXT3_FS_POSIX_ACL=y
-CONFIG_EXT3_FS_SECURITY=y
-CONFIG_EXT3_FS_XATTR=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y
 CONFIG_EXT4_FS_SECURITY=y