axs10x: Add support of Ext2/4 FS

Those could be easily used on USB flash drives or on SD/MMC cards.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/configs/axs103_defconfig b/configs/axs103_defconfig
index fb8e72f..bcd4754 100644
--- a/configs/axs103_defconfig
+++ b/configs/axs103_defconfig
@@ -13,6 +13,9 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_EXT2=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y