uboot: disable spi flash protection at boot

Change-Id: I4190055cd9bb483848f84697e8441a43283c0e32
diff --git a/board/mv_feroceon/mv_kw2/mv_main.c b/board/mv_feroceon/mv_kw2/mv_main.c
index aa38fd3..37f8596 100644
--- a/board/mv_feroceon/mv_kw2/mv_main.c
+++ b/board/mv_feroceon/mv_kw2/mv_main.c
@@ -418,7 +418,7 @@
 		"run gfparams; "
 		"sf read $loadaddr $gfkernel 0xe00000; "
 		"setenv bootargs $console $mtdparts root=$gfroot $mvNetConfig "
-		"$bootargs_extra; bootm $loadaddr;");
+		"$bootargs_extra; sf protect off; bootm $loadaddr;");
 }
 
 char* set_mtdparts(void)