Use /data/vendor_ce/0/facedata for FaceHAL's secure storage

Also remove "import android.provider.Settings" per checkstyle_hook's
warning.

Bug: 129754192
Test: Manually verify that debug data is written into
      /data/vendor_ce/0/facedata.
Change-Id: I8a00c338c2a665510757fc8686f802b3badf2765
1 file changed