ColdFire:disable the NFS define for 52277 board.

There is no network device on ColdFire 52277EVB board.But the default
cmd include NFS define which make the build error.
Signed-off-by: NJason Jin <Jason.jin@freescale.com>

include/configs/M52277EVB.h

@@ -69,6 +69,7 @@
 #define CONFIG_CMD_MEMORY
 #define CONFIG_CMD_MISC
 #undef CONFIG_CMD_NET
+#undef CONFIG_CMD_NFS
 #define CONFIG_CMD_REGINFO
 #undef CONFIG_CMD_USB
 #undef CONFIG_CMD_BMP