The bindings for the CPU frequency scaling driver require a specific
compatible for the SoC. Add the compatible.

Fixes: 0c665213 ("arm64: dts: qcom: sdm670: add cpu frequency scaling")
Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230816230412.76862-9-mailingradian@gmail.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>