Stop camera enumeration after finding first camera

The first one returned generally specifies the vendor's recommended
camera. We can also check lens focal length but it's not necessary.

Fixes: 112482387

Test: manual
Change-Id: Iab245f278ce1bf69ea95f7c081d20e837e84fe51

src/com/android/settings/biometrics/face/FaceEnrollPreviewFragment.java

@@ -236,6 +236,7 @@ public class FaceEnrollPreviewFragment extends InstrumentedPreferenceFragment {
                         CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
                 mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
                         width, height, MAX_PREVIEW_WIDTH, MAX_PREVIEW_HEIGHT);
+                break;
             }
         } catch (CameraAccessException e) {
             Log.e(TAG, "Unable to access camera", e);