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/arch/arm/mach-zynq/clk.c b/arch/arm/mach-zynq/clk.c
index b578f65..1ace117 100644
--- a/arch/arm/mach-zynq/clk.c
+++ b/arch/arm/mach-zynq/clk.c
@@ -6,6 +6,7 @@
 #include <clk.h>
 #include <common.h>
 #include <dm.h>
+#include <init.h>
 #include <malloc.h>
 #include <asm/arch/clk.h>