Migrate IUsb implementation to AIDL

This change migrates IUsb implementation to AIDL.
Also, IUsb and IUsbGadget now run in its own processes
to improve stability and isolation.

Port of 3c97a6bb68f6418ee41026f3bd0024405c97cf0c

Bug: 200993386
Change-Id: I681c1ba9c4f547e3cf5dc0fa7c9ee1aaf4fd603c
15 files changed