Migrate IUsbGadget to AIDL am: 1eaaea47b2

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2361672

Change-Id: I244f402206f22cb6a8c1bfa92e24ce80908c5da2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>