HID: apple-touchbar: avoid nested runtime PM in PM callbacks

Runtime suspend of the Touch Bar display stalls because its HID suspend
callback requests a runtime PM resume while already running as part of the
same USB PM transition. The nested request waits for the transition that
invoked the callback to finish.

The matching resume callback has the same problem. It can stall after the
virtual host controller has successfully resumed the port.

The mode update is therefore split into an active-device helper and a
runtime-PM-managed wrapper. Both PM callbacks call the active-device
helper and no longer acquire a nested runtime PM reference.

We maintain the apple-bce/t2bce virtual host controller used on these
systems. Although that module is not yet upstream, its runtime PM path has
already been adjusted so the complete suspend and resume cycle works with
this change.

Signed-off-by: Andre Eikmeyer <dev@deq.rocks>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

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