uboot/prism: disable dying gasp on MPP20

Change-Id: I182148ccef3175ffb09a2fc7692b224d40cd3479
diff --git a/board/mv_feroceon/mv_kw2/kw2_family/boardEnv/mvBoardEnvSpec.h b/board/mv_feroceon/mv_kw2/kw2_family/boardEnv/mvBoardEnvSpec.h
index f9e63da..b42dc20 100644
--- a/board/mv_feroceon/mv_kw2/kw2_family/boardEnv/mvBoardEnvSpec.h
+++ b/board/mv_feroceon/mv_kw2/kw2_family/boardEnv/mvBoardEnvSpec.h
@@ -623,7 +623,7 @@
 
 #define GFLT300_MPP0_7		0x22222220
 #define GFLT300_MPP8_15		0x05000002
-#define GFLT300_MPP16_23	0x00420000
+#define GFLT300_MPP16_23	0x00400000
 #define GFLT300_MPP24_31	0x44204544
 #define GFLT300_MPP32_37	0x00000024