msm: ADSPRPC: Support handles being passed in the invocation

Handles can now be passed in the RPC invocations which would
bypass the cache operations and send the pages over to the remote
subsystem for it to map locally.

Change-Id: If205221f4c91874f3fbae85a2e813c3a99fee0bf
Signed-off-by: Sathish Ambley <sathishambley@codeaurora.org>