alsa_sound: Fix to Support in-call uplink recording

Uplink recording during voice call fails as the case was not
 getting handled while opening the input stream.
 -Added support for Incall Uplink recording in openInputStream.

GTalk call doesn't work if call is started during an existing
 recording session. All subsequent calls are failing after this
 scenario
 - Move the pcm device node open to read() call instead which will
   avoid opening the pcm device node of normal recording session
   and doesn't go into the error state. This will allow GTalk call
   to work and also all the subsequent calls to work

CRs-Fixed: 517810
Change-Id: I440ac4090b9f3e3a70b8acb4a818cfbf97e8c868