UPSTREAM: drm/virtio: remove irrelevant DRM_UNLOCKED flag

DRM_UNLOCKED doesn't do anything for non-legacy drivers. Remove it.

Cc: David Airlie <airlied@linux.ie>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: virtualization@lists.linux-foundation.org
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190522154702.16269-2-emil.l.velikov@gmail.com


Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit cbb56814fbe7fedd71cd6b29dc83bab2915a5b74)
Signed-off-by: Greg Hartman <ghartman@google.com>
BUG: 139386237
Change-Id: I2a99803f684ed6a87b6ffa503502974c2d569f9d