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/keymile/kmp204x/ddr.c b/board/keymile/kmp204x/ddr.c
index ee2e3d6..bea9451 100644
--- a/board/keymile/kmp204x/ddr.c
+++ b/board/keymile/kmp204x/ddr.c
@@ -9,6 +9,7 @@
 #include <common.h>
 #include <i2c.h>
 #include <hwconfig.h>
+#include <init.h>
 #include <asm/mmu.h>
 #include <fsl_ddr_sdram.h>
 #include <fsl_ddr_dimm_params.h>