post: new nor flash test

This adds a simple flash test to automatically verify erasing,
writing, and reading of sectors.  The code is based on existing
Blackfin tests but generalized for everyone to use.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/include/post.h b/include/post.h
index 519cef1..3f259b7 100644
--- a/include/post.h
+++ b/include/post.h
@@ -186,6 +186,7 @@
 #define CONFIG_SYS_POST_BSPEC5		0x00100000
 #define CONFIG_SYS_POST_CODEC		0x00200000
 #define CONFIG_SYS_POST_COPROC		0x00400000
+#define CONFIG_SYS_POST_FLASH		0x00800000
 
 #endif /* CONFIG_POST */