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/lib/tpl.c b/arch/x86/lib/tpl.c
index f9dcf32..ac265b6 100644
--- a/arch/x86/lib/tpl.c
+++ b/arch/x86/lib/tpl.c
@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <hang.h>
 #include <image.h>
+#include <init.h>
 #include <spl.h>
 #include <asm/cpu.h>
 #include <asm/mtrr.h>