Audio/Volume: Fix volume button playback control

When playback control enabled in volume button settings,

Case 1 : Wake up device enabled in volume button settings
- When volume button pressed, the device is wake up and skip the current music.
- Current music is skipped by short press and volume adjustment only working when screen on.

Case 2: Wake up device disabled in volume button settings
- When volume button pressed while screen offed, volume adjustment is not working.
- Also media control is not working by long press.

This patch fixes Case 2 issue.
Playback control only working properly when wake up device is disabled.

Change-Id: I867e1e86a644ab0087eecf9bb1279460c710d379