UPSTREAM: drm/virtio: use drm_poll(..) instead of virtio_gpu_poll(..)

With the use of dummy events, we can drop virtgpu specific
behavior.

Fixes: cd7f5ca3 ("drm/virtio: implement context init: add virtio_gpu_fence_event")
Reported-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20211122232210.602-3-gurchetansingh@google.com


Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 42abd004)

BUG=b:176158390, b:203009046, b:230100768
TEST=gfxbench and deqp-cts in arcvm

Signed-off-by: Rob Clark <robdclark@chromium.org>
Change-Id: Ia4dbad82a862b678a2c4aa0723a43fd0a0744d4a
Disallow-Recycled-Builds: test-failures
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3602855


Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Chia-I Wu <olv@google.com>
Reviewed-by: Ryan Neph <ryanneph@google.com>