arm: marvell: Extract kirkwood gpio functions into new common file gpio.c

This makes is possible to use those gpio functions from other MVEBU SoC's as well.

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/arch/arm/include/asm/arch-kirkwood/cpu.h b/arch/arm/include/asm/arch-kirkwood/cpu.h
index 97daa40..5900a15 100644
--- a/arch/arm/include/asm/arch-kirkwood/cpu.h
+++ b/arch/arm/include/asm/arch-kirkwood/cpu.h
@@ -144,7 +144,7 @@
 unsigned int kw_sdram_bs(enum memory_bank bank);
 void kw_sdram_size_adjust(enum memory_bank bank);
 int kw_config_adr_windows(void);
-void kw_config_gpio(unsigned int gpp0_oe_val, unsigned int gpp1_oe_val,
+void mvebu_config_gpio(unsigned int gpp0_oe_val, unsigned int gpp1_oe_val,
 		unsigned int gpp0_oe, unsigned int gpp1_oe);
 int kw_config_mpp(unsigned int mpp0_7, unsigned int mpp8_15,
 		unsigned int mpp16_23, unsigned int mpp24_31,