audio: Move frame counter to StreamContext

Moving frame counter to the StreamContext class enables
switching stream drivers on the fly while keeping the frame
count monotonically increasing.

StreamWorkerCommonLogic now holds a pointer to StreamContext,
which makes redundant storing copies of the fields of the latter.

Bug: 264712385
Test: atest VtsHalAudioCoreTargetTest
Change-Id: If6716f4051c484b52927cbfe4032df7c907eb3a5