clk: qcom: hfpll: register as clock provider

Make the output of the high frequency pll a clock provider.
On the QCS404 this PLL controls cpu frequency scaling.

Co-developed-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>