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/liebherr/display5/spl.c b/board/liebherr/display5/spl.c
index 0f5eab7..fc3ebaf 100644
--- a/board/liebherr/display5/spl.c
+++ b/board/liebherr/display5/spl.c
@@ -8,6 +8,7 @@
 #include <cpu_func.h>
 #include <env.h>
 #include <image.h>
+#include <init.h>
 #include <serial.h>
 #include <spl.h>
 #include <linux/libfdt.h>