arm64: dts: qcom: sm8150: Add cpufreq HW device node

Add cpufreq HW device node to scale 4-Silver/3-Gold/1-Gold+ cores
on SM8150 SoCs.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Link: https://lore.kernel.org/r/20191219120633.20723-1-sibis@codeaurora.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>