Remove placeholder API from camera.provider

This API was added to work around an AIDL versioning issue that has now
been fixed.
The changed imports now count as a change to the interface, so this
placeholder API is no longer needed.

Test: m
bug: 237048744
Change-Id: I6c3edb156435b5d66578fe8250716333e0f54d6e
3 files changed