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/drivers/rtc/mvrtc.h b/drivers/rtc/mvrtc.h
index ce7a69b..ebddc12 100644
--- a/drivers/rtc/mvrtc.h
+++ b/drivers/rtc/mvrtc.h
@@ -12,7 +12,7 @@
 #ifndef _MVRTC_H_
 #define _MVRTC_H_
 
-#include <asm/arch/kirkwood.h>
+#include <asm/arch/soc.h>
 #include <compiler.h>
 
 /* RTC registers */