Fix volume rocker

1. When volume button pressed the device is wakeup by default volume_wake_screen setting.
(This can fix with com.android.settings's database file.
 Changed system/volume_wake_screen to 0 from 1.)
2. Volume rocker enabled by default and when volume button pressed, volume adjustment is not working. But next/prev is working by short press.
3. When volume button pressed with volume_wake_screen disabled and screen offed, volume adjustment is not working.

This patch fixes 2nd and 3rd issues.

Change-Id: I93b527c6ce3393e77802a4a30c3e4c6d37d3bee1