Remove unused AIDL files

These files show up in a glob for all AIDL files, but are not listed
in AIDL files to be built, and have no references in codesearch
except for one unused import.

Bug: 70046217
Test: m checkbuild
Change-Id: I7d6a3bb19d2e16b5f09473f3058afcf5b4edd9b6