arm: Enable REBOOT when RUNTIME_NMI is selected

This patch enables REBOOT when RUNTIME_NMI is selected via defconfig
file. This action is required to prevent compilation errors.

Change-Id: I06869cb86b1abc151974df66797a0b25ee62e166
Signed-off-by: Vincenzo Frascino <[email protected]>
(cherry picked from commit cc28833)

Author: Vincenzo Frascino

arch/arm/core/cortex_m/Kconfig

@@ -135,6 +135,7 @@ config NUM_IRQ_PRIO_BITS
 config RUNTIME_NMI
 	bool
 	prompt "Attach an NMI handler at runtime"
+	select REBOOT
 	default n
 	help
 	The kernel provides a simple NMI handler that simply hangs in a tight