This sample demonstrates how gpio pins can be used to power on
the system after a Poweroff, just like a reset pin.
The user only needs to add the STM32_GPIO_WKUP flag to the gpio pin
in "gpios" property of a DT device such a button or a sensor.
The samples Powers off the system after a delay then the user can power it
on with the user button that has the STM32_GPIO_WKUP flag in DT.
Only works on STM32 boards that support Zephyr POWEROFF
(U5, WL, WB, & L4 SoC series), & also have a user button whose GPIO pin
is associated with a wake-up pin (see PWR node in SoC dtsi file).
Signed-off-by: Abderrahmane Jarmouni <abderrahmane.jarmouni-ext@st.com>
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