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/BuR/brppt2/board.c b/board/BuR/brppt2/board.c
index c91d2f9..f156b55 100644
--- a/board/BuR/brppt2/board.c
+++ b/board/BuR/brppt2/board.c
@@ -9,6 +9,7 @@
 #include <common.h>
 #include <cpu_func.h>
 #include <hang.h>
+#include <init.h>
 #include <spl.h>
 #include <dm.h>
 #include <miiphy.h>