drm_hwcomposer: Add support for virtual connectors

Allow virtual connector type in order to support virtio-gpu.

BUG=none
TEST=Tested with virtio-gpu on QEMU

Change-Id: I7ae5091d3587bcae75da6bff23d7bc85aa6164f1
Signed-off-by: Rob Herring <robh@kernel.org>
1 file changed