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/freescale/ls1021aqds/ddr.c b/board/freescale/ls1021aqds/ddr.c
index d3e2e53..d854b51 100644
--- a/board/freescale/ls1021aqds/ddr.c
+++ b/board/freescale/ls1021aqds/ddr.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <fsl_ddr_sdram.h>
 #include <fsl_ddr_dimm_params.h>
+#include <init.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
 #include "ddr.h"