POST: add POST_STOP flag

Don't run futher tests in case of a test fails that is marked as
POST_STOP.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
diff --git a/include/post.h b/include/post.h
index dfed24b..123623f 100644
--- a/include/post.h
+++ b/include/post.h
@@ -43,6 +43,7 @@
 #define POST_PREREL             0x1000  /* test runs before relocation */
 
 #define POST_CRITICAL		0x2000	/* Use failbootcmd if test failed */
+#define POST_STOP		0x4000	/* Interrupt POST sequence on fail */
 
 #define POST_MEM		(POST_RAM | POST_ROM)
 #define POST_ALWAYS		(POST_NORMAL	| \