Let's provide the proper link from the touchscreen to the panel on
trogdor devices where the touchscreen support it. This allows the OS
to power sequence the touchscreen more properly.

For the most part, this is just expected to marginally improve power
consumption while the screen is off. However, in at least one trogdor
model (wormdingler) it's suspected that this will fix some behavorial
corner cases when the panel power cycles (like for a modeset) without
the touchscreen power cycling.

NOTE: some trogdor variants use touchscreens that don't (yet) support
linking the touchscreen and the panel. Those variants are left alone.
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Benjamin Tissoires <bentiss@kernel.org>
Acked-by: Benjamin Tissoires <bentiss@kernel.org>
Link: https://lore.kernel.org/r/20230727101636.v4.11.Ia06c340e3482563e6bfd3106ecd0d3139f173ca4@changeidSigned-off-by: Bjorn Andersson <andersson@kernel.org>