Create IRadio AIDL

Create IRadio AIDL from HIDL versions 1.0-1.6 using the hidl2aidl tool.
This is just a skeleton implementation to allow 1.7 APIs to be added to
the AIDL interface. Changes to the API surface and modularization to
come after this change is merged.

Test: build
Bug: 198331182
Change-Id: Ice71b7c159b98de8b36124f379167fb579a4ea2f
Merged-In: Ice71b7c159b98de8b36124f379167fb579a4ea2f