lib: os: reboot: Disable ZLIs before reboot

We currently only disable "normal" IRQs with irq_lock(). This is not
sufficient if ZLIs are enabled, as even though they are supposed to
be "above" the kernel, they must not interrupt the reboot procedure.

Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>

lib/os/reboot.c

@@ -23,6 +23,10 @@ FUNC_NORETURN void sys_reboot(int type)
 
 	(void)irq_lock();
 
+#if defined(CONFIG_ZERO_LATENCY_IRQS)
+	(void)arch_zli_lock();
+#endif /* CONFIG_ZERO_LATENCY_IRQS */
+
 	/* Disable caches to ensure all data is flushed */
 #if defined(CONFIG_ARCH_CACHE)
 #if defined(CONFIG_DCACHE)