[coreboot] [PATCH] Add subsystem callbacks for VIA

[Rudolf Marek]

Hi all,

Following patch adds subsystem callbacks for VT8237x and VT890 family of chipsets.

Tested only partially because the device on/off is done in strange way not using 
the devicetree, which I might address in the future.

Signed-off-by: Rudolf Marek

Thanks,
Rudolf