hal: Update active input stream for Voip when voip input started

When voip input started, active input stream is not updated.
Therefore, as active input stream is NULL no tx device switch
occurs for a voip call with primary output.

Fixed this by updating active input stream for voip when
voip input started.

Change-Id: I058bfaa0091eea4a0259224de17be32f271dbdc9
CRs-Fixed: 710923
1 file changed