msm: clock-krait: Clock ops library for Krait subsystem clocks

The Krait subsystem has its own clock tree. Implement a clock-krait library
that provides a set of clock ops that model all the clock components
present in the Krait subsystem clock tree.

Change-Id: I41bb4243c28cd666ebe8e7c5a814c85401d92308
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>