arm64: dts: meson: a1: add secure power domain controller

Enable power domain controller for Meson A1 SoC.

Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
Link: https://lore.kernel.org/r/1579087831-94965-5-git-send-email-jianxin.pan@amlogic.com


Signed-off-by: Kevin Hilman <khilman@baylibre.com>