msm: msm_bus: Introduce bus rule update API

Adding the bus_rule_update API to allow clients to
update existing rules with a single function call
as well as an API to immediately evaluate the current
bus rules.

Change-Id: Ia86e5a9c82e7f21c6445c4c56fe0197fc11e6615
Acked-by: AJ Lindell <alindell@qti.qualcomm.com>
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>