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/bosch/guardian/board.c b/board/bosch/guardian/board.c
index 03ba9e8..b8dbe8a 100644
--- a/board/bosch/guardian/board.c
+++ b/board/bosch/guardian/board.c
@@ -14,6 +14,7 @@
 #include <env_internal.h>
 #include <errno.h>
 #include <i2c.h>
+#include <init.h>
 #include <led.h>
 #include <miiphy.h>
 #include <panel.h>