arm64: dts: qcom: sc7280: Fixup the cpufreq node

Fixup the register regions used by the cpufreq node on SC7280 SoC to
support per core L3 DCVS.

Fixes: 7dbd121a

 ("arm64: dts: qcom: sc7280: Add cpufreq hw node")
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1627581885-32165-4-git-send-email-sibis@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>