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/arch/microblaze/cpu/exception.c b/arch/microblaze/cpu/exception.c
index bdcbe08..b8dedc4 100644
--- a/arch/microblaze/cpu/exception.c
+++ b/arch/microblaze/cpu/exception.c
@@ -6,6 +6,7 @@
  */
 
 #include <common.h>
+#include <hang.h>
 #include <asm/asm.h>
 
 void _hw_exception_handler (void)