Greylist camera API used by CameraITS test

CameraITS CTS test returns the contents of hidden fields in several
android/hardware/camera2/ classes back to the host-side test driver.
These need to be greylisted for the test to succeed.

Bug: 64382372
Bug: 76163369
Test: follow instructions in cts/apps/CameraITS/CameraITS.pdf
Change-Id: I9cacd7422547a52f678a3b2d357f8998ff9664d7