clk: qcom: clk-hfpll: use poll_timeout macro

Use regmap_read_poll_timeout macro instead of do-while structure to tidy
things up. Also set a timeout to prevent any sort of system stall.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220430054458.31321-2-ansuelsmth@gmail.com