Iterate over the remote control stack from top to bottom
when (un)registering a remote control client (RCC).
When unregistering an RCC, stop traversing the stack when
match found. If match was at top of the stack, update
the remote control display (RCD).
Change-Id: If64acf102bdf328085d707f9e0f7e86cf4d4001a
ed2d10dab7