frameworks/av: Fix no audio issue during MT call ring tone

No audio is observed during MT call ring tone playback. This is due to
update of mStreamType flag to AUDIO_STREAM_DEFAULT when attributes are used.
Use streamType flag which is derived from attributes instead of mSteamType
while creating track to avoid createTrack failures.

Change-Id: I7ddc79e45b81fd380abad209e26150110a6a806f