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/board/intel/minnowmax/minnowmax.c b/board/intel/minnowmax/minnowmax.c
index e5fc939..e486f9d 100644
--- a/board/intel/minnowmax/minnowmax.c
+++ b/board/intel/minnowmax/minnowmax.c
@@ -5,6 +5,7 @@
 
 #include <common.h>
 #include <dm.h>
+#include <init.h>
 #include <asm/gpio.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>