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Add system power off support for i.MX8QX,
when Linux kernel issues "poweroff" command,
TF-A will send command to inform system
controller to power off whole board according
to board design, tested on i.MX8QX MEK board.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>

This patch adds support for NXP's imx SoC common
function support like topology, gic implementation.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>