Add support for the S6 S7 S7D power controller, whose registers are in the secure domain and should be accessed via SMC. Signed-off-by: hongyu.chen1 <hongyu.chen1@amlogic.com> Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com> Link: https://lore.kernel.org/r/20250822-pm-s6-s7-s7d-v1-2-82e3f3aff327@amlogic.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>