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Add support for A4 power controller. A4 power control
registers are in secure domain, and should be accessed by SMC.
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
Link: https://lore.kernel.org/r/20240529-a4_secpowerdomain-v2-2-47502fc0eaf3@amlogic.com

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