Fix for N4 Video and inclusion of CaptureIntent

Fix for N4 Video and inclusion of CaptureIntent

Bug: 20694189

Workaround b/19271661 needs to specifically applied in
these circumstances only:
1.  Phone is Nexus4
2.  CaptureModule is enabled
3.  Photo Mode, OR Capture Intent Photo is enabled.

Since we are passing the CameraActivity in TextureViewHelper,
it has enough context to know everything.  Previous implementation
used an invalid CameraProvider to signal that Camera2 was enabled.
Now we just ask the CameraActivity directly.

Change-Id: I47f841ae6476bc034a7ad3f487c40616eed05b71