awin framebuffer support, not sure if this works yet because hdmi is not working yet
add awintcon, awindebe, genfb, wsdisplay, wsmux, wsfont
fix error messages.
If we can't determine the preferred display mode for some reason, fallback
to 640x480.
add WSDISPLAY_TYPE_ALLWINNER
Use correct IWN_HW_REV_TYPE_MASK.