Camera2: Add 3A maxRegions tag to legacy device

    }

    private static void mapControlOther(CameraMetadataNative m, Camera.Parameters p) {

        /*

         * android.control.maxRegions

         */

        int[] maxRegions = new int[3];

        maxRegions[0] = p.getMaxNumMeteringAreas();

        maxRegions[1] = 0; // AWB regions not supported in API1

        maxRegions[2] = p.getMaxNumFocusAreas();

        m.set(CONTROL_MAX_REGIONS, maxRegions);

        // TODO

    }