hammerhead: enable audio main mic
hammerhead: enable audio main mic

Remove some unused audio route, reset stream mixer initial values to 0

Change-Id: I4e0ce99ea447192701426b7ae534e0413a9e473a
Signed-off-by: Cong Zhou <cc25479d729f5943e7a48aae1526865562f174c1@lge.com>
Signed-off-by: Sungmin Choi <e608684d77791b6ae7d18711d2f062c89a239110@lge.com>

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead