ARM: zynq: Enable the FAT write capability

Enable the FAT write capability for SD/MMC write
functionality.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

include/configs/zynq-common.h

@@ -86,6 +86,7 @@
 # define CONFIG_CMD_FAT
 # define CONFIG_SUPPORT_VFAT
 # define CONFIG_CMD_EXT2
+# define CONFIG_FAT_WRITE
 # define CONFIG_DOS_PARTITION
 #endif