complier.h: add __noreturn and use it in code base

Add a __noreturn macro that wraps __attribute__((noreturn)) and replace
current users with the macro.

Change-Id: Iddd0728cf79678c3d1c1f7e7946c27375a644a7d
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/28505
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/include/halt.h

@@ -20,10 +20,11 @@
 #ifdef __ROMCC__
 #include <lib/halt.c>
 #else
+#include <compiler.h>
 /**
  * halt the system reliably
  */
-void __attribute__((noreturn)) halt(void);
+void __noreturn halt(void);
 #endif /* __ROMCC__ */
 
 /* Power off the system. */