[nrf noup] Lock thread stack before factory reset

This commit fix a problem with thread activity interrupting factory reset.
This activity used to led to “Factory reset fail: -6”.
Writing to cleared nvm flash pages caused the problem.

Signed-off-by: Patryk Lipinski <patryk.lipinski@nordicsemi.no>
Signed-off-by: Michał Szablowski <michal.szablowski@nordicsemi.no>

src/platform/Zephyr/ConfigurationManagerImpl.cpp

@@ -177,6 +177,11 @@ void ConfigurationManagerImpl::DoFactoryReset(intptr_t arg)
 {
     ChipLogProgress(DeviceLayer, "Performing factory reset");
 
+// Lock the Thread to not interupt in settings during factory reset
+#ifdef CONFIG_NET_L2_OPENTHREAD
+    ThreadStackMgr().LockThreadStack();
+#endif
+
 #ifdef CONFIG_CHIP_FACTORY_RESET_ERASE_NVS
     void * storage = nullptr;
     int status     = settings_storage_get(&storage);