audioflinger: exchange AUDIO_SOURCE_HOTWORD with AUDIO_SOURCE_VOICE_RECOGNITION for pre-kitkat blobs.

Change-Id: I6241cf6667c97dfd7fb1c238b1fbadea5cdb863e
Merge pull request #6 from CarbonDev/kk

audioflinger: exchange AUDIO_SOURCE_HOTWORD with AUDIO_SOURCE_VOICE_RECO...