pmdomain: amlogic: Add support for A5 power domains controller

Add support for the A5 power controller, whose registers are
in the secure domain and should be accessed via SMC.

Signed-off-by: Hongyu Chen <hongyu.chen1@amlogic.com>
Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240627-a5_secpower-v1-2-1f47dde1270c@amlogic.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>