(2/N)[MediaProjection] Show dialog when token is reused

Validate if the IMediaProjection token (representing
the user's consent) is used to get more than one
MediaProjection instance, or if client app is trying to
invoke MediaProjection#createVirtualDisplay more than
once.

Re-show the permission dialog for target SDK below U.

Follow-on CLs will:
* Black out recording when waiting for consent

Bug: 274790702
Test: atest FrameworksServicesTests:MediaProjectionManagerServiceTest
Change-Id: I30c96d9a9afd69fba29314caeeb867f665bb83ad