arm64: dts: qcom: msm8953: correct RPMCC node name

The bindings expect RPM clock controller subnode to be named
'clock-controller':

  msm8953-motorola-potter.dtb: smd: rpm:rpm-requests: 'rpmcc' does not match any of the regexes: '^regulators(-[01])?$', 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230308125906.236885-7-krzysztof.kozlowski@linaro.org