Revert "msm: ADSPRPC: Use audio context bank for compute"

The remote processor now supports access to additional context
banks and hence move over to using the context banks that has
been reserved for compute purposes.

Change-Id: Ie33a6bcffdff0004f4c0d6ce77603630d8bc35ab
Signed-off-by: Sathish Ambley <sathishambley@codeaurora.org>