arm64: dts: qcom: msm8996: Rename cluster OPP tables

Rename cluster OPP table node names to match the nodename pattern
defined in the opp-v2-base DT schema.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>