BasicCameraFactory: check if continuous picture af is available before requesting it.

Bug: 119284303

Test: Click a picture on a device without AF on front camera.

Change-Id: I5133d56d69f7a1f6e01d6682fff91202aaa9be17
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>
4 files changed