arm64: dts: qcom: sm8250: add description of dcvsh interrupts

The change adds SM8250 cpufreq-epss controller interrupts for each
CPU core cluster.

Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Cc: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211223075640.2924569-1-vladimir.zapolskiy@linaro.org