Implement camera privacy allowlist.

This feature enables the user to access the camera for certain
driver assistance applications regardless of the device-wide global
camera privacy toggle in order to preserve user safety and meet
safety regulations.

Flag: ACONFIG com.android.internal.camera.flags.privacy_allowlist DEVELOPMENT
Bug: 300986585
Test: Build and test using  kitchensink.
Change-Id: Ia566e1c28c9dee559007bbbcf84b78d15fa3edde