msm: msm_bus: Rules engine for adhoc driver

Introduce rules engine module for adhoc driver. This module
allows creating rules based on client votes that can be used
to throttle certain master ports or to receive callbacks when
certain combinations of votes have been made.

Change-Id: I532eb42a9399514131dcda47440f966cfe732f76
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>