clk: qcom: kpss-xcc: register it as clk provider

krait-cc use this driver for the secondary mux. Register it as a clk
provider to correctly use this clk in other drivers.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221108211734.3707-1-ansuelsmth@gmail.com