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-owl/soc.c b/arch/arm/mach-owl/soc.c
index 8a434bd..7d3f6f6 100644
--- a/arch/arm/mach-owl/soc.c
+++ b/arch/arm/mach-owl/soc.c
@@ -6,6 +6,7 @@
  */
 
 #include <cpu_func.h>
+#include <init.h>
 #include <asm/cache.h>
 #include <linux/arm-smccc.h>
 #include <linux/psci.h>