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/spl.c b/arch/arm/mach-zynq/spl.c
index 627c84c..05f42e6 100644
--- a/arch/arm/mach-zynq/spl.c
+++ b/arch/arm/mach-zynq/spl.c
@@ -6,6 +6,7 @@
 #include <debug_uart.h>
 #include <hang.h>
 #include <image.h>
+#include <init.h>
 #include <spl.h>
 #include <generated/dt.h>