rockchip: ram: rk3399: update reg map for of-platdata

After Simon's patch, the dtoc can work with 64bit address,
so we need to fix reg number for it.
Depend on Simon's patch set:
https://patchwork.ozlabs.org/cover/807266/



Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/mach-rockchip/rk3399/sdram_rk3399.c

@@ -1115,7 +1115,7 @@ static int conv_of_platdata(struct udevice *dev)
 	int ret;
 
 	ret = regmap_init_mem_platdata(dev, dtplat->reg,
-			ARRAY_SIZE(dtplat->reg) / 4,
+			ARRAY_SIZE(dtplat->reg) / 2,
 			&plat->map);
 	if (ret)
 		return ret;