common: Move hang() to the same header as panic()

At present panic() is in the vsprintf.h header file. That does not seem
like an obvious choice for hang(), even though it relates to panic(). So
let's put hang() in its own header.

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Migrate a few more files]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/renesas/ebisu/ebisu.c b/board/renesas/ebisu/ebisu.c
index b608c61..81d7f8e 100644
--- a/board/renesas/ebisu/ebisu.c
+++ b/board/renesas/ebisu/ebisu.c
@@ -8,6 +8,7 @@
 
 #include <common.h>
 #include <cpu_func.h>
+#include <hang.h>
 #include <malloc.h>
 #include <netdev.h>
 #include <dm.h>