format: Add R8_G8B8_422_UNORM format
format: Add R8_G8B8_422_UNORM format
This is the format that drivers will want to use for NV16
without YUV conversion (if they support this natively).
Previously we had NV16 working but it was always emulated
with R8 + GR88.
Fixes: 440b69210ae ("dri, mesa: fix NV16 texture format")
Edited by Eric Smith