common: Drop init.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/braswell/braswell.c b/arch/x86/cpu/braswell/braswell.c
index 7a83b06..3345049 100644
--- a/arch/x86/cpu/braswell/braswell.c
+++ b/arch/x86/cpu/braswell/braswell.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 #include <asm/mrccache.h>
 #include <asm/post.h>