drm/msm/dp: Implement hpd_notify()

The DisplayPort controller's hot-plug mechanism is based on pinmuxing a
physical signal on a GPIO pin into the controller. This is not always
possible, either because there aren't dedicated GPIOs available or
because the hot-plug signal is a virtual notification, in cases such as
USB Type-C.

For these cases, by implementing the hpd_notify() callback for the
DisplayPort controller's drm_bridge, a downstream drm_bridge
(next_bridge) can be used to track and signal the connection status
changes.

This makes it possible to use downstream drm_bridges such as
display-connector or any virtual mechanism, as long as they are
implemented as a drm_bridge.

Signed-off-by: Bjorn Andersson <[email protected]>
[bjorn: Drop connector->fwnode assignment and dev from struct msm_dp]
Signed-off-by: Bjorn Andersson <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Kuogee Hsieh <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/514410/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

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