arm: kirkwood: Change naming of dram functions from km_foo() to mvebu_foo()

Additionally the SDRAM address decoding register address is not hard coded
in the C code any more. A define is introduced for this base address.

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/soc.h b/arch/arm/include/asm/arch-kirkwood/soc.h
index 4ef32c7..58ed71b 100644
--- a/arch/arm/include/asm/arch-kirkwood/soc.h
+++ b/arch/arm/include/asm/arch-kirkwood/soc.h
@@ -22,6 +22,7 @@
 #define KW_REG_UNDOC_0x1470		(KW_REGISTER(0x1470))
 #define KW_REG_UNDOC_0x1478		(KW_REGISTER(0x1478))
 
+#define MVEBU_SDRAM_BASE		(KW_REGISTER(0x1500))
 #define KW_TWSI_BASE			(KW_REGISTER(0x11000))
 #define KW_UART0_BASE			(KW_REGISTER(0x12000))
 #define KW_UART1_BASE			(KW_REGISTER(0x12100))