policy_hal: Avoid invalidation of music stream if not required.

 -APM tries to open output for all profiles supported on headphone
  device During insertion of headphone and invalidate music stream
  if number of output doesn't matches with outputs on previous device.
  Since DSD profile is supported on headphone device only, APM opens
  DSD output on headphone insertion and invalidate music stream.

 -Check if any of the new output is for DSD profile if number of output
  doesn't match on new device and prev device. Avoid invalidation if
  difference in outputs is because of DSD output.

Change-Id: I97092f620851b22a66a6f9cbfc9337db3828c5d6