Sync with new drm common aidl interface

A common base aidl interface is introduced.

This is safe (and unflagged) because the same types are simply moved to a different compilation unit, and it's only build time changes.

Flag: EXEMPT bugfix
Bug: 293945485
Test: manaul
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9373e8311ccedf55da1a5ad101f6c25e578c9629)
Merged-In: I54b1ebbb1e9e3467ecb401555c4de42dfcaf8ca6
Change-Id: I54b1ebbb1e9e3467ecb401555c4de42dfcaf8ca6