arm64: dts: qcom: msm8939: Use mboxes properties for APCS

Instead of passing the syscon to the various nodes, use the mbox
interface using the mboxes property.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240424-apcs-mboxes-v1-4-6556c47cb501@z3ntu.xyz


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