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/xtensa/cpu/cpu.c b/arch/xtensa/cpu/cpu.c
index 6f4b88f..85d3464 100644
--- a/arch/xtensa/cpu/cpu.c
+++ b/arch/xtensa/cpu/cpu.c
@@ -10,6 +10,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <init.h>
 #include <vsprintf.h>
 #include <linux/stringify.h>
 #include <asm/global_data.h>