This change migrates IUsb implementation to AIDL.
Also, IUsb and IUsbGadget now run in its own processes
to improve stability and isolation.
Bug: 200993386
Bug: 199357330
Change-Id: I02753af4a41916b77ce110f9531504bf8c6a4691
Merged-In: I02753af4a41916b77ce110f9531504bf8c6a4691
(cherry picked from commit 3c97a6bb68)