arch/arm/Kconfig : Disable MPU based stack protection if selected v8m arch
arch/arm/Kconfig : Disable MPU based stack protection if selected v8m arch

ARMv8M MPU cannot permit to overlap the region.
So we cannot use MPU based stack protection on ARMv8M architecture.
We can refer to the belows:
https://developer.arm.com/documentation/100235/0100/The-Cortex-M33-Peripherals/Security-Attribution-and-Memory-Protection/Memory-Protection-Unit?lang=en
"When memory regions overlap, the processor generates a fault if a core access hits the overlapping regions."

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