camera: Fix disabling location

If Camera.removeGpsData() is invoked from the userland API, we
must invalidate the previously stored GPS data to prevent it from
being saved in EXIF.

Fixes the invalid storing of location data after an explicit disable
Fixes android.hardware.cts.CameraTest#testJpegExif

Change-Id: I9618a27ab9def974bac1d69871c3454300fb4c29