Camera2: Unhide deferred surface configuration APIs

To speed up camera startup, allow setting up a camera capture session
before all the output Surfaces are available (but their eventual sizes
and types are known). Also allow images to be captured to the
non-deferred outputs even before the deferred outputs are available.

This allows parallelizing of camera startup and UI layout.

Test: android.hardware.camera2.cts.SurfaceViewPreviewTest#testDeferrredSurfaces 
passes
Bug: 31319716
Change-Id: I657efc39bb8cc2d4bf201e5d70807a227ef82dde