x86: Remove <common.h> and add needed includes

Remove <common.h> from all x86 architecture files and when needed add
missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/x86/cpu/ivybridge/sdram_nop.c b/arch/x86/cpu/ivybridge/sdram_nop.c
index 51dfe23..e7ec35b 100644
--- a/arch/x86/cpu/ivybridge/sdram_nop.c
+++ b/arch/x86/cpu/ivybridge/sdram_nop.c
@@ -3,9 +3,9 @@
  * Copyright (c) 2016 Google, Inc
  */
 
-#include <common.h>
 #include <init.h>
 #include <asm/global_data.h>
+#include <asm/u-boot.h>
 
 DECLARE_GLOBAL_DATA_PTR;