stagefright: Don't enforce 16kHz rate for AMR-WB

This breaks android.media.cts.MediaRecorderTest#testRecordingAudioInRawFormats,
which tests specifically with 8kHz.

Change-Id: Ibfa54db4b2a82e502268be18f4ea405a41a88bfd
disable camera sounds (3/3)

Change-Id: I3540e652cdc5601dd5ea83a314b96f98d0cd9917