DO NOT MERGE: Move camera headers to camera/include

In preparation for moving libcamera_client to Soong, this is a backport
of the camera portion of the change to move headers from include/ into
the appropriate directories.

include/camera -> camera/include/camera

Adds a symlink from the old location to the new one.

Bug: 33241851
Test: mmma -j frameworks/av/camera
Change-Id: Ic508c2d0100f4e84b63e745d50eca1402b6fed6c
(cherry picked from commit d008fd1e)