sunxi: add option for 16-bit DW DRAM controller

Some Allwinner SoCs features a DesignWare-like controller with only 16
bit bus width.

Add support for them.

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
2 files changed