imx6: enable f2fs and loopback support in preparation for squashfs with overlay support

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

target/linux/imx6/Makefile

@@ -20,6 +20,6 @@ include $(INCLUDE_DIR)/target.mk
 
 KERNELNAME:=zImage dtbs
 
-DEFAULT_PACKAGES += uboot-envtools
+DEFAULT_PACKAGES += uboot-envtools mkf2fs e2fsprogs
 
 $(eval $(call BuildTarget))

target/linux/imx6/config-4.14

@@ -55,6 +55,7 @@ CONFIG_ASSOCIATIVE_ARRAY=y
 CONFIG_ATA=y
 CONFIG_ATAGS=y
 CONFIG_AUTO_ZRELADDR=y
+CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_MQ_PCI=y
 CONFIG_BLK_SCSI_REQUEST=y
 CONFIG_CACHE_L2X0=y
@@ -108,6 +109,7 @@ CONFIG_CRYPTO_AKCIPHER2=y
 CONFIG_CRYPTO_AUTHENC=y
 CONFIG_CRYPTO_CBC=y
 # CONFIG_CRYPTO_CHACHA20_NEON is not set
+CONFIG_CRYPTO_CRC32=y
 CONFIG_CRYPTO_CRC32C=y
 # CONFIG_CRYPTO_CRC32_ARM_CE is not set
 CONFIG_CRYPTO_CRYPTD=y
@@ -178,6 +180,11 @@ CONFIG_EXT4_FS_ENCRYPTION=y
 CONFIG_EXT4_FS_POSIX_ACL=y
 CONFIG_EXT4_FS_SECURITY=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_FEC=y
 CONFIG_FIXED_PHY=y
 CONFIG_FIX_EARLYCON_MEM=y