venus: avoid forcing linear tiling for common wsi
Since the guest VMs have been made modifier aware via the recent zwp_linux_dma_buf_v1
(v3/v4) efforts, we can skip the intermediate prime blit optimization to using real modifiers for common wsi (started with xwayland).
Over to Ryan since this is pretty much ready!
(to be noted: venus Android wsi was born with modifier support)