drm: bridge: adv7511: Enable DRM_BRIDGE_OP_HPD based on HPD interrupt

Connector detection using poll method won't work in case of bridge
attached to the encoder with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR, as
the code defaults to HPD.

Enable DRM_BRIDGE_OP_HPD based on HPD interrupt availability, so that
it will fall back to polling, if HPD is not available.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220419142453.48839-1-biju.das.jz@bp.renesas.com