Add audio.common types AIDL definition

This is a subset of the types defined in
hardware/interfaces/audio/common/2.0/types.hal.
Specifically, the subset that sound trigger depends on.
These files were auto-generated using the hidl2aidl tool, and
later manually edited to workaround some missing features in
the conversion tool or AIDL (mostly around enum support).

Change-Id: I1c0ffe8a2ebaf09eb4516beaaf4b6fc80985bfc9
Bug: 142070343