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/fpu/20010226-1.c b/post/lib_powerpc/fpu/20010226-1.c
index cc4aa0d..a65ffce 100644
--- a/post/lib_powerpc/fpu/20010226-1.c
+++ b/post/lib_powerpc/fpu/20010226-1.c
@@ -7,7 +7,7 @@
  * This file is originally a part of the GCC testsuite.
  */
 
-#include <common.h>
+#include <config.h>
 
 #include <post.h>