Revert "audioflinger: apply volume on direct track when track is active"

Causes issues with MortPlayer (LPA).  Track starts/resumes playing, but volume is forced to zero, until a track-change occurs.

4-17 21:41:51.492 D/ALSADevice(  256): setHardwareParams: reqBuffSize 262144 channels 2 sampleRate 44100
04-17 21:41:51.492 D/ALSADevice(  256): setHardwareParams: buffer_size 1048576, period_size 262144, period_cnt 4
04-17 21:41:51.492 W/AudioFlinger(  256): There was no effectChain created for the sessionId(283)
04-17 21:41:51.512 E/AudioFlinger(  256): setting observer mOutputDesc track 0x40c598a0, obv 0x40c598b0
04-17 21:41:51.512 D/AudioSessionOutALSA(  256): setLpaVolume(0)
04-17 21:41:51.512 D/AudioSessionOutALSA(  256): Setting LPA volume to 0 (available range is 0 to 100)
04-17 21:41:51.512 D/ALSADevice(  256): setMixerControl:: name LPA RX Volume value 0 index 0
04-17 21:41:51.512 D/AudioSessionOutALSA(  256): setLpaVolume(0)
04-17 21:41:51.512 D/AudioSessionOutALSA(  256): Setting LPA volume to 0 (available range is 0 to 100)

Change-Id: I6e0ee8cd7c2f577ca5b4cb834c7a83703db4b167