msm: clock-krypton: Add clock driver for krypton

Move the existing dummy clock definitions from board-krypton to this new
file. Add additional dummy clock definitions for use by other drivers.

Change-Id: Ife7c5a3858ff66f30b730738158683cbf4d3359d
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>