cpufreq: dt-platdev: Add JH7110 SOC to the allowlist

Add the compatible strings for supporting the generic
cpufreq driver on the StarFive JH7110 SoC.

Signed-off-by: Mason Huo <mason.huo@starfivetech.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>