Adding USB audio-class 2.0 spec descriptors.

Added USB audio-class 2.0 format type descriptors.
Added Tree parsing.
Rearchitected reporting (again) to better support reuse and scale.

Bug: 64301464

Test: Run code against representative USB audio peripherals and verify
that each correctly handles or ignores all descriptors and the correct
device semantics (headset / not-headset) are still calculated.

Change-Id: I1b3b01ab1cd804ed876bf6427c3afba15eea6a6e