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/gpio/kw_gpio.c b/drivers/gpio/kw_gpio.c
index 0af75a8..4fca089 100644
--- a/drivers/gpio/kw_gpio.c
+++ b/drivers/gpio/kw_gpio.c
@@ -16,7 +16,7 @@
 #include <common.h>
 #include <asm/bitops.h>
 #include <asm/io.h>
-#include <asm/arch/kirkwood.h>
+#include <asm/arch/soc.h>
 #include <asm/arch/gpio.h>
 
 static unsigned long gpio_valid_input[BITS_TO_LONGS(GPIO_MAX)];