audio: Fix fast playback of Ringtone for SCO call

A2DP output is in suspend state during SCO call,but
becuase of incorrect logic in checkA2DPSuspended,
'mA2dpSuspended' was not set to true, and hence A2DP
output is selected during SCO call, resulting in fast
playback of ringtone on speaker.
This change reverts the commit
a985bd576ad8642b1ab99cc3a4e8bfd18c33e133

Change-Id: I6744d15688d33cbe7b8a1584cc779ebf305c75df