audio: Force route on HAL when USB headset is disconnected

- snd device reference count is not decremented when usb
  headset is unplugged, because touch tone is still active
  on usb headset. So when usb is plugged again device
  routing is not triggered as present and prev devices are
  same
- Fix is to force routing audio to speaker as soon as usb
  headset is disconnected
- Added similar check for HDMI device too as it applies
  for HDMI disconnection scenario too

CRs-Fixed: 655403

Change-Id: I3d66654ebc1f324b08104b586f201540f7005dd2