ASoC: msm: Add support for Multisession ADSP SVA

SVA feature is used for user voice recognition and
activation. SVA can support multiple session on ADSP.
Curently upto 8 session are supported for SVA. This
change adds support for multiple sessions for SVA
in audio driver.

Change-Id: I76ee45b9224bae64ed92ef15e90237d498787666
Signed-off-by: Venkat Sudhir <vsudhir@codeaurora.org>