audio: Fix for LPCM surround sound recording

 - Format WAVE was defined as 10, which is getting
 over-ridden by format THREE_GPP2 (which holds value 10),
 because of which Media recorder failed for LPCM SSR.
 - Fix this by defining format WAVE to 11.

Change-Id: I4db84441b70b28da3579e2ff430b42b2711f9404