Adding MIDI 2.0 host mode support to Android. MIDI 2.0 peripherals
create an alternative setting for Universal Midi Packets (UMP).
UMP packets can be passed directly through as the host has full
control. Instead of going through the ALSA, UMP packets can be
sent directly through a UsbDeviceConnection.
This CL also adds public apis to expose whether the pipe supports
UMP. This for MidiDeviceInfo in Java and AMidi in c++.
Bug: 201003646
Bug: 214447324
Test: Verified that the MIDI 1.0 path still works as before.
Test: Tested that MIDI 2.0 packets are passed through the pipe
with MIDIScope and MIDIKeyboard
Test: atest MidiSoloTest
Test: atest CtsMidiTestCases
Test: NativeMidiEchoTest
Change-Id: Idff8a3b9bdd05857239260fc3e6af7253f8f992f
a936a25198