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/board/Marvell/rd6281a/rd6281a.c b/board/Marvell/rd6281a/rd6281a.c
index df5fbea..b0020c9 100644
--- a/board/Marvell/rd6281a/rd6281a.c
+++ b/board/Marvell/rd6281a/rd6281a.c
@@ -93,7 +93,7 @@
 	gd->bd->bi_arch_number = MACH_TYPE_RD88F6281;
 
 	/* adress of boot parameters */
-	gd->bd->bi_boot_params = kw_sdram_bar(0) + 0x100;
+	gd->bd->bi_boot_params = mvebu_sdram_bar(0) + 0x100;
 
 	return 0;
 }