msm: adsprpc: HMX,Async-FastRPC capability

Added two extra capabilities - HMX and Async FastRPC.
Async FastRPC checks the DSP for capability and
ANDs it with its own capability
which is then returned to the userspace.

Change-Id: I3310b76ccdafad664eff5f12493c9d3fc45cc4ca
Signed-off-by: Anirudh Raghavendra <araghave@codeaurora.org>