axolotl: Drop unnecessary BOARD_USERDATAIMAGE_FILE_SYSTEM_TYPE flag

Change-Id: Ibb96c529ac64239d7bb919e46f5a625a6deebf98
diff --git a/BoardConfig.mk b/BoardConfig.mk
index b0eb507..813fb8b 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -269,7 +269,6 @@
 TARGET_USERIMAGES_USE_EXT4 := true
 TARGET_USERIMAGES_USE_F2FS := true
 BOARD_USERDATAIMAGE_PARTITION_SIZE := 108982120448
-BOARD_USERDATAIMAGE_FILE_SYSTEM_TYPE := f2fs
 
 # vendor.img
 BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE := ext4