msm: clock: Move part of clock framework to drivers/clk/qcom

Architectural changes in the ARM Linux kernel tree mandate
the eventual removal of the mach-* directories. Move some part of
core clock framework to drivers/clk/qcom as first step.

Change-Id: Ia9577607c5ac57e85669cfa2b4fb2287745f5b98
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>