Integrate meta-seco-imx/linux-seco-imx/seco_lf-5.10.y_integrate_kill_power

Commit: edgehog/layers/seco/meta-seco-imx@f745552f

Integrate linux-seco-imx/seco_lf-5.10.y_integrate_kill_power

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Commit: edgehog/bsp/nxp/linux-seco-imx@7de1d5d9

[IMX6][PWR] add poweroff and reboot system with kill power GPIO this feature allow the cpu to turn off the power of the board on poweroff using a GPIO; the kill power GPIO have to be specified in the device tree with a power_signal node:

power_signal: power_signal {
	power-gpio = <&gpio2 4 0>;
};

modified:   arch/arm/include/asm/mach/arch.h
modified:   arch/arm/include/asm/system_misc.h
modified:   arch/arm/kernel/reboot.c
modified:   arch/arm/kernel/setup.c
modified:   arch/arm/mach-imx/mach-imx6q.c