board: gateworks: venice: switch to 2-bank dram config

Switch to a 2-bank dram config to properly support 4GiB.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/board/gateworks/venice/venice.c b/board/gateworks/venice/venice.c
index 3067480..a39ae58 100644
--- a/board/gateworks/venice/venice.c
+++ b/board/gateworks/venice/venice.c
@@ -20,7 +20,7 @@
 	if (!size)
 		return -EINVAL;
 
-	*size = get_ram_size((void *)PHYS_SDRAM, PHYS_SDRAM_SIZE);
+	*size = get_ram_size((void *)PHYS_SDRAM, (long)PHYS_SDRAM_SIZE + (long)PHYS_SDRAM_2_SIZE);
 
 	return 0;
 }