arm64: dts: qcom: ipq6018: use CPUFreq NVMEM

IPQ6018 comes in multiple SKU-s and some of them dont support all of the
OPP-s that are current set, so lets utilize CPUFreq NVMEM to allow only
supported OPP-s based on the SoC dynamically.

As an example, IPQ6018 is generaly rated at 1.8GHz but some silicon only
goes up to 1.5GHz and is marked as such via an eFuse.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231021120048.231239-1-robimarko@gmail.com


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