arm: rmobile: rcar: Add support ext2 and ext4 file system

Board with R-Car SoC has USB and MMC. They might use the EXT2 or EXT4 file system.
This adds support ext2 and ext4 file system
Signed-off-by: NNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: NNobuhiro Iwamatsu <iwamatsu@nigauri.org>

include/configs/rcar-gen2-common.h

@@ -28,6 +28,9 @@
 #define CONFIG_CMD_FAT
 #define CONFIG_CMD_SF
 #define CONFIG_CMD_SPI
+#define CONFIG_CMD_EXT2
+#define CONFIG_CMD_EXT4
+#define CONFIG_CMD_EXT4_WRITE
 
 #define CONFIG_SYS_THUMB_BUILD
 #define CONFIG_SYS_GENERIC_BOARD
@@ -36,6 +39,7 @@
 #define CONFIG_FAT_WRITE
 #define CONFIG_DOS_PARTITION
 #define CONFIG_SUPPORT_VFAT
+#define CONFIG_FS_EXT4
 #define CONFIG_EXT4_WRITE
 
 #define CONFIG_CMDLINE_TAG