CameraITS scene4 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: I4db00dbf1408ff86e8021ffa14ebaa1df48788f1
diff --git a/apps/CameraITS/tests/scene4/test_aspect_ratio_and_crop.py b/apps/CameraITS/tests/scene4/test_aspect_ratio_and_crop.py
index 39e3c38..8ff7f73 100644
--- a/apps/CameraITS/tests/scene4/test_aspect_ratio_and_crop.py
+++ b/apps/CameraITS/tests/scene4/test_aspect_ratio_and_crop.py
@@ -68,6 +68,7 @@
         # Todo: test for radial distortion enabled devices has not yet been
         # implemented
         its.caps.skip_unless(not its.caps.radial_distortion_correction(props))
+        its.caps.skip_unless(its.caps.read_3a(props))
         full_device = its.caps.full_or_better(props)
         limited_device = its.caps.limited(props)
         its.caps.skip_unless(full_device or limited_device)