arm64: dts: qcom: sm8450: remove invalid properties in cluster-sleep nodes

Fixes the following DT bindings check error:
domain-idle-states: cluster-sleep-0: 'idle-state-name', 'local-timer-stop' do not match any of the regexes:
'pinctrl-[0-9]+'
domain-idle-states: cluster-sleep-1: 'idle-state-name', 'local-timer-stop' do not match any of the regexes:
'pinctrl-[0-9]+'

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230323-topic-sm8450-upstream-dt-bindings-fixes-v2-2-0ca1bea1a843@linaro.org