arm64: dts: qcom: msm8916: Conform to the nodename pattern PSCI subnodes

Subnodes for PSCI should start with "power-domain-", so let's adopt to
this.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20200326103932.5809-3-ulf.hansson@linaro.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>