Use the timestamp reported by the HAL for aaudio.

Use the timestamp reported by the HAL if it is accurate.

For the audio HAL whose version is less than 7.0,
getPresentationPosition is an optional API. In that case, it may not
report the timestamp correctly. If the reported position is not
changed within the time of 5 burst size, the reported timestamp from
the HAL will not be used.

For the audio HAL whose version is 7.0 or later, the
getPresentationPosition API is mandatory. In that case, the reported
timestamp is expected to be a valid one. But in the real practice, the
HAL may not always report the timestamp correctly for MMAP case. To
avoid reporting wrong timestamp to apps, the timestamp from the HAL is
not trusted if
1) reported position is going backwards or
2) reported timestamp is going backwards or
3) timestamp or position is frozon for a certain time.

Bug: 158609200
Test: atest AAudioTests
Change-Id: Ib6a9825936f3db15b68d2c7af8c578182566f52a