dt-bindings: cpufreq: cpufreq-qcom-hw: Add SM6375 compatible

Add compatible for EPSS CPUFREQ-HW on SM6375.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>