Added get descriptors length function to enable direct access to raw descriptors.

Bug: 68936964
Test: manual
Peripherals - Skylab, Mir, HTC dongle, Microsoft LX-3000 (headset), Rosewill (gaming) headset
Peripherals - PreSonus AudioBox 22VSL

Change-Id: Icbfd64c3ac29acab6a4c731d604cb0e620e41dc6
2 files changed