hammerhead: audio gain tuning for Voice Recognition

increase ADC1 volume from 13(19.5dB) to 15(22.5dB).
increase DEC6 Volume from 84(0dB) to 88(4dB).
HH has passed ASR with these gains.

Change-Id: Iee21e2c0e47f7b7a0a763aaae9dc393479c00bcc
1 file changed