Audio service: Refactor register interface

Remove all per interface version boilerplate.
Adding a new version now requires only including the file
and adding the version name to the list.

Bug: 134940862
Test: adb shell lshal
Change-Id: Ib6b99d7a2c2079d914970fbe804aaf3c78c143ce
Merged-In: Ib6b99d7a2c2079d914970fbe804aaf3c78c143ce
Signed-off-by: Kevin Rocard <krocard@google.com>