common: Move some board functions out of common.h

A number of board function belong in init.h with the others. Move them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/keymile/km_arm/km_arm.c b/board/keymile/km_arm/km_arm.c
index 922cc62..7f83ec1 100644
--- a/board/keymile/km_arm/km_arm.c
+++ b/board/keymile/km_arm/km_arm.c
@@ -14,6 +14,7 @@
 #include <common.h>
 #include <env.h>
 #include <i2c.h>
+#include <init.h>
 #include <nand.h>
 #include <netdev.h>
 #include <miiphy.h>