CameraITS scene5 should be skipped if read_3a is not supported

Some cameras does not support read_3a.
The test should include its.caps.skip_unless(its.caps.read_3a(props))
when checking the camera properties.

Change-Id: I879023cf48af6f01e391206b84bb52c03a0b6e6b
diff --git a/apps/CameraITS/tests/scene5/test_lens_shading_and_color_uniformity.py b/apps/CameraITS/tests/scene5/test_lens_shading_and_color_uniformity.py
index 282b82e..984b6b0 100644
--- a/apps/CameraITS/tests/scene5/test_lens_shading_and_color_uniformity.py
+++ b/apps/CameraITS/tests/scene5/test_lens_shading_and_color_uniformity.py
@@ -52,6 +52,7 @@
 
     with its.device.ItsSession() as cam:
         props = cam.get_camera_properties()
+        its.caps.skip_unless(its.caps.read_3a(props))
         # Converge 3A and get the estimates.
         sens, exp, gains, xform, focus = cam.do_3a(get_results=True,
                                                    do_af=False,