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/m68k/cpu/mcf523x/cpu.c b/arch/m68k/cpu/mcf523x/cpu.c
index 8c808a6..225bdc2 100644
--- a/arch/m68k/cpu/mcf523x/cpu.c
+++ b/arch/m68k/cpu/mcf523x/cpu.c
@@ -9,6 +9,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 #include <net.h>
 #include <vsprintf.h>
 #include <watchdog.h>