alsa_sound : Fix for audio routing speaker though BT is connected

- Speaker device is selected by getDeviceForStrategy() though BT is
  connected as mA2dpSuspended is still remaining as 'true' even
  after ending the voice call.
- This flag is not updated by checkA2dpSuspend() as force usage
  for communication and record is still FORCE_BT_SCO after ending
  voice call.
- Modified condition check to set mA2dpSuspended to 'false' as soon
  as phone state is changed to MODE_NORMAL

Change-Id: Ibc0d19b361755d8715c446401d2e14d914fd7020
CRs-Fixed: 464404