post: Remove <common.h> and add needed includes

Remove <common.h> from all "post/" files and when needed add
missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/post/lib_powerpc/cmpi.c b/post/lib_powerpc/cmpi.c
index 6e2bd63..6436586 100644
--- a/post/lib_powerpc/cmpi.c
+++ b/post/lib_powerpc/cmpi.c
@@ -4,7 +4,7 @@
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  */
 
-#include <common.h>
+#include <config.h>
 #include <irq_func.h>
 
 /*