Don't allow 3p apps to become voice recognizer automatically

Currently, If there is no default recognizer set using config_systemSpeechRecognizer, any 3p app defining recongition service could become the default recognizer automatically without user selection. Make sure that we only automatically select system apps rather random 3p app.

Test: Manual, install 3p app defining recognizer when no default or
system recognizer is available on the device
Bug: 352518318
Flag: EXEMPT CVE_FIX

Change-Id: I52681da7381be4ebe6cf20b639508311f3a90eba