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/st/stih410-b2260/board.c b/board/st/stih410-b2260/board.c
index 35bf497..b1147f2 100644
--- a/board/st/stih410-b2260/board.c
+++ b/board/st/stih410-b2260/board.c
@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <cpu_func.h>
+#include <init.h>
 #include <asm/cache.h>
 #include <linux/usb/otg.h>
 #include <dwc3-sti-glue.h>