FROMLIST: mbox: qcom: add APCS child device for QCS404

There is clock controller functionality in the APCS hardware block of
qcs404 devices similar to msm8916.

am link: https://patchwork.kernel.org/patch/10784447/



Co-developed-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Khasim Syed Mohammed <khasim.mohammed@linaro.org>