CameraITS: gate tests that need per frame control

Bug: 17994909

Change-Id: Ibbc68d0809d4597c88cc62b1862ba7912afb4dce
diff --git a/apps/CameraITS/tests/scene1/test_linearity.py b/apps/CameraITS/tests/scene1/test_linearity.py
index 90ad3ab..a9063a9 100644
--- a/apps/CameraITS/tests/scene1/test_linearity.py
+++ b/apps/CameraITS/tests/scene1/test_linearity.py
@@ -47,7 +47,8 @@
 
     with its.device.ItsSession() as cam:
         props = cam.get_camera_properties()
-        its.caps.skip_unless(its.caps.compute_target_exposure(props))
+        its.caps.skip_unless(its.caps.compute_target_exposure(props) and
+                             its.caps.per_frame_control(props))
 
         e,s = its.target.get_target_exposure_combos(cam)["midSensitivity"]
         s /= 2