Camera: Heic: Wait for first output tile callback before muxer start

In order for muxer to start writing any track, the format returned from
onFormatChanged must first be available. By waiting for first output
tile callback, we are guaranteed to have received onFormatChanged, which
means a valid format is available for muxer to use.

This change also makes it such that no multiple muxers are inflight, avoiding
dequeueBuffer failure because right now we only support maximum dequeued
buffer count to be 1.

Add more verbose logs for ease of debugging.

Test: Vendor testing
Bug: 141169323
Change-Id: I16fd11f5558e525ceae59df00533553e4b4e7589