Implement server side playback timestamps with 64 bit accuracy

Provide server timestamps if the HAL doesn't provide it.
Provide monotonic - boottime translation.
Integrate record timestamps and playback timestamps together.

Bug: 17472992
Bug: 22871200
Bug: 26400089
Bug: 26682703
Change-Id: If1974f94232fcce7ba0bbcdf63d9e54ed51918ff
22 files changed