[nrf noup] Lock thread stack before factory reset

This commit fix problem with thread activity interupting factory reset.
This activity used to lead to "Factory reset fail: -6".
Writing to cleared nvm flash pages caused the problem.

Signed-off-by: Patryk Lipinski <patryk.lipinski@nordicsemi.no>

src/platform/Zephyr/ConfigurationManagerImpl.cpp

@@ -177,6 +177,8 @@ void ConfigurationManagerImpl::DoFactoryReset(intptr_t arg)
 {
     ChipLogProgress(DeviceLayer, "Performing factory reset");
 
+    ConnectivityMgr().ErasePersistentInfo();
+
 #ifdef CONFIG_CHIP_FACTORY_RESET_ERASE_NVS
     void * storage = nullptr;
     int status     = settings_storage_get(&storage);
@@ -197,8 +199,6 @@ void ConfigurationManagerImpl::DoFactoryReset(intptr_t arg)
     {
         ChipLogError(DeviceLayer, "Factory reset failed: %" CHIP_ERROR_FORMAT, err.Format());
     }
-
-    ConnectivityMgr().ErasePersistentInfo();
 #endif
 
     PlatformMgr().Shutdown();