MIPS: configs: ci20: Enable ext4

Now that we have MMC support, enable ext2/3/4 support
in the CI20 defconfig.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Acked-by: James Hogan <jhogan@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

arch/mips/configs/ci20_defconfig

@@ -111,6 +111,7 @@ CONFIG_DMADEVICES=y
 CONFIG_DMA_JZ4780=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_MEMORY=y
+CONFIG_EXT4_FS=y
 # CONFIG_DNOTIFY is not set
 CONFIG_PROC_KCORE=y
 # CONFIG_PROC_PAGE_MONITOR is not set