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>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Ondrej Kubik <ondrej.kubik@canonical.com>