drm/bridge: ti-sn65dsi86: Implement wait_hpd_asserted

This bridge doesn't actually implement HPD due to it being way too slow
but instead expects the panel driver to wait enough to assume HPD is
asserted. However some panels (such as the generic 'edp-panel') expect
the bridge to deal with the delay and pass maximum delay to the aux
instead.

In order to support such panels, add a dummy implementation of wait
that would just sleep the maximum delay and assume no failure has
happened.

Signed-off-by: Nikita Travkin <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Signed-off-by: Douglas Anderson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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