Clean up HAL render position reporting

Since AIDL HAL reports 64-bit position values, move the logic
for proper expansion of 32-bit positions from AudioStreamOut
into StreamOutHidl. Add synchronization which did not exist
in AudioStreamOut. This is because the calling code
does not always use same mutexes when calling into relevant
methods, thus data races are possible.

Also, clean up StreamOutHalInterface and AudioStreamOut
interface by removing obsolete methods.

Bug: 338557486
Test: atest CtsMediaAudioTestCases
Change-Id: I30701af589f3721b3d8bf7886acc251ceefadc46