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: Jason Jin <Jason.jin@freescale.com>
diff --git a/include/configs/M52277EVB.h b/include/configs/M52277EVB.h
index bb3b474..5722544 100644
--- a/include/configs/M52277EVB.h
+++ b/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