arm: kirkwood: Remove duplicate definition of CONFIG_CMD_FAT

include/configs/guruplug.h defined CONFIG_CMD_FAT twice.

Signed-off-by: Quentin Armitage <quentin@armitage.org.uk>
diff --git a/include/configs/guruplug.h b/include/configs/guruplug.h
index 318ea87..48dd0e6 100644
--- a/include/configs/guruplug.h
+++ b/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