audio: Fix ringtone mute issue

- Voice call ringtone is muted after multi party call
- Primary output suspend count is incremented twice during multi party
  call and decremented only once, which is causing the primary o/p not
  opening at all after ending the call
- Fix is not to call close again on the closed output by checking the
  flag status

Change-Id: I2bcdcb2591942f48eac4635a3b36ee575787ee92