msm: clock-krait-8974: Change init call to subsys_initcall

clock-krait-8974 plays a critical role in scaling cpu frequency. It needs
to be ready early. Therefore, probe it right after its dependency
is met (clock driver). Move it to subsys_initcall level.

Change-Id: Ib70cdae65b5349b58498eaac6a9ae9d3a94d5d12
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>