zynq: enable kernel overlay and f2fs support

Select configs to enable build-in F2FS support
and use the overlayfs provided by generic config

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

target/linux/zynq/config-4.14

@@ -169,6 +169,7 @@ CONFIG_CRC32_SLICEBY8=y
 CONFIG_CROSS_MEMORY_ATTACH=y
 CONFIG_CRYPTO_AEAD=y
 CONFIG_CRYPTO_AEAD2=y
+CONFIG_CRYPTO_CRC32=y
 CONFIG_CRYPTO_CRC32C=y
 CONFIG_CRYPTO_HASH=y
 CONFIG_CRYPTO_HASH2=y
@@ -213,6 +214,11 @@ CONFIG_ELF_CORE=y
 CONFIG_ENABLE_MUST_CHECK=y
 CONFIG_EXT4_FS=y
 CONFIG_EXTCON=y
+# CONFIG_F2FS_CHECK_FS is not set
+CONFIG_F2FS_FS=y
+# CONFIG_F2FS_FS_SECURITY is not set
+CONFIG_F2FS_FS_XATTR=y
+CONFIG_F2FS_STAT_FS=y
 CONFIG_FAT_FS=y
 CONFIG_FB=y
 CONFIG_FB_CFB_COPYAREA=y
@@ -490,7 +496,6 @@ CONFIG_OLD_SIGACTION=y
 CONFIG_OLD_SIGSUSPEND3=y
 CONFIG_OUTER_CACHE=y
 CONFIG_OUTER_CACHE_SYNC=y
-# CONFIG_OVERLAY_FS is not set
 CONFIG_PADATA=y
 CONFIG_PAGE_OFFSET=0xC0000000
 # CONFIG_PARTITION_ADVANCED is not set