common: Move some board functions out of common.h

A number of board function belong in init.h with the others. Move them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/intel/slimbootloader/slimbootloader.c b/board/intel/slimbootloader/slimbootloader.c
index f50eeb8..b20ddf0 100644
--- a/board/intel/slimbootloader/slimbootloader.c
+++ b/board/intel/slimbootloader/slimbootloader.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 
 int board_early_init_r(void)
 {