audio: Force route call on HAL during device disconnection

- When a wired accessory is connected/disconnected,
  setDeviceConnectionState updates the current device
  only for active outputs and also makes the corresponding
  route call on Audio HAL when the current device is not
  same as the previous device for the active outputs. As
  inactive outputs are not updated in this case, sometimes
  audio policy fails to notify device change to HAL.
  Specific scenario is mentioned below

- If headset is inserted when touch tones are disabled
  and music is in progress, LPA/tunnelled output is updated
  with headset as its current device and also respective
  route call is made on audio HAL. But low latency output
  still has speaker as its current device because it is not
  active. Later, if music is paused and headset is removed,
  setOutputDevice does not make route call on Audio HAL
  when touch tones are played. This is because the current
  device and previous device are same(speaker) for low
  latency output. So Audio HAL tries to play the touch tone
  on headset when headset is not connected.

- Fix is to force route call on HAL after every device
  disconnection irrespective of current and previous device
  being same for the specific output

Change-Id: I80d799718c980d0422d4e5f7015fcf16f001fda9
CRs-Fixed: 627903
audio: Close the file descriptor in error scenarios

 -In the scenario where the USB headset and proxy device
  sample rate dont match, error was returned without
  closing the file descriptor .So, the next time USB
  headset is inserted , the /proc entries are not created
  which results in the USB headset playback not started
  as the capabilities cannot be read.
 - Closing the file descriptor in the error scenario fixes
  the issue.

Change-Id: Ie45327f04cc7fff6dbcbe1268a7f34793e89641b