drm/dp_mst: Remove PDT teardown in drm_dp_destroy_port() and refactor

This will allow us to add some locking for port->* members, in
particular the PDT and ->connector, which can't be done from
drm_dp_destroy_port() since we don't know what locks the caller might be
holding.

Note that we already do this in delayed_destroy_work (renamed from
destroy_connector_work in this patch) for ports, we're just making it so
mstbs are also destroyed in this worker.

Changes since v2:
* Clarify commit message
Changes since v4:
* Clarify commit message more

Cc: Juston Li <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Daniel Vetter <[email protected]>
Reviewed-by: Sean Paul <[email protected]>
Signed-off-by: Lyude Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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