Add a test to ensure the size of audio bit mask enum types

Verify that both C and C++ code sees audio bit mask enums
as 32-bit values. This is assumed by a lot of code.

The test is run at presubmit.

Bug: 169889714
Test: m systemaudio_tests
Change-Id: Ibef7b11a9ce4fb8773444088dc1ba870c0c5791a
4 files changed