board: ti: enable support for writing to fat partition

Enable support for writing to FAT partitions on
TI's boards.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
diff --git a/board/ti/common/Kconfig b/board/ti/common/Kconfig
index e35afa0e..c21eb8c 100644
--- a/board/ti/common/Kconfig
+++ b/board/ti/common/Kconfig
@@ -27,6 +27,7 @@
 	imply CMD_EXT4_WRITE
 	imply CMD_FASTBOOT if FASTBOOT
 	imply CMD_FAT
+	imply FAT_WRITE if CMD_FAT
 	imply CMD_FS_GENERIC
 	imply CMD_GPIO
 	imply CMD_GPT