arm: kirkwood: Remove duplicate definition of CONFIG_CMD_FAT

include/configs/guruplug.h defined CONFIG_CMD_FAT twice.
Signed-off-by: NQuentin Armitage <quentin@armitage.org.uk>

include/configs/guruplug.h

@@ -57,7 +57,6 @@
 #define CONFIG_CMD_NAND
 #define CONFIG_CMD_PING
 #define CONFIG_CMD_USB
-#define CONFIG_CMD_FAT
 
 /*
  * mv-common.h should be defined after CMD configs since it used them