AAudio: Improve buffer size calculations

This CL improves the calculations for both burst and buffer sizes.

1. This CL now uses the hardware burst size for its calculations.
2. This CL now uses a number of bursts for buffer size calculations.

Bug: 310024737
Test: OboeTester glitch test with loopback dongle
Change-Id: I04db1342a55b18a2e9b076052b4b3b0965a4c511