SurfaceFlinger: add setAllowedDisplayConfigs

Add an API to ISurfaceComposer to set allowed display configurations.
This API is expected to be called by DisplayManager depends on the
current policy in place. Once setAllowedDisplayConfigs is called,
SF can only set a new display config if it is part of the allowed
configurations list.

Test: call setAllowedDisplayConfigs() from backdoor and
      observe config change.
Bug: 122905403
Change-Id: I1d0a3649bbe7a08efeb72dc270f0b2df330b021c