aaudio: command line argument parser

Generic parser that is used in multiple examples.

Added -n{numberOfBursts} for buffer size.

This is being used to test the MMAP features.

Bug: 63002656
Test: this is a test
Change-Id: Idf7560f9bb3ed7834f6c4686dd6009f27f04220e
Merged-In: Idf7560f9bb3ed7834f6c4686dd6009f27f04220e
7 files changed