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/drivers/ram/rockchip/sdram_rk3188.c b/drivers/ram/rockchip/sdram_rk3188.c
index 9b5eb38..4f3ed73 100644
--- a/drivers/ram/rockchip/sdram_rk3188.c
+++ b/drivers/ram/rockchip/sdram_rk3188.c
@@ -12,6 +12,7 @@
 #include <dt-structs.h>
 #include <errno.h>
 #include <hang.h>
+#include <init.h>
 #include <ram.h>
 #include <regmap.h>
 #include <syscon.h>