arm: marvell: Move arch/kirkwood.h to arch/soc.h

This move makes is possible to use this header not only from kirkwood
platforms but from all Marvell mvebu platforms.

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Luka Perkov <luka@openwrt.org>
Acked-by: Prafulla Wadaskar <prafulla@marvell.com>
diff --git a/board/d-link/dns325/dns325.c b/board/d-link/dns325/dns325.c
index ff70e94..f2f43f5 100644
--- a/board/d-link/dns325/dns325.c
+++ b/board/d-link/dns325/dns325.c
@@ -14,7 +14,7 @@
 #include <miiphy.h>
 #include <netdev.h>
 #include <asm/arch/cpu.h>
-#include <asm/arch/kirkwood.h>
+#include <asm/arch/soc.h>
 #include <asm/arch/mpp.h>
 #include <asm/arch/gpio.h>
 #include "dns325.h"