[nrfconnect] Don't erase factory keys on the factory reset (#12253)

* [nrfconnect] Don't erase factory keys on the factory reset

The factory reset on nRF Connect platforms erases all
settings starting with "mt/". Make sure that factory
configuration keys are not descendants of the "mt" subtree,
so use "mt-fact" prefix for them.

* Restyled by clang-format

Co-authored-by: Restyled.io <commits@restyled.io>

src/platform/Zephyr/ZephyrConfig.cpp

@@ -41,13 +41,12 @@ namespace Internal {
     (key);                                                                                                                         \
     static_assert(sizeof(key) <= SETTINGS_MAX_NAME_LEN, "Config key too long: " key)
 
-// Define the configuration keys to be part of the CHIP_DEVICE_CONFIG_SETTINGS_KEY subtree
-// so that they get erased when KeyValueStoreManagerImpl::DoFactoryReset() is called.
-// clang-format off
-#define NAMESPACE_FACTORY  CHIP_DEVICE_CONFIG_SETTINGS_KEY "/fct/"
-#define NAMESPACE_CONFIG   CHIP_DEVICE_CONFIG_SETTINGS_KEY "/cfg/"
+// Define the configuration keys (except the factory keys) to be part of the
+// CHIP_DEVICE_CONFIG_SETTINGS_KEY subtree so that they get erased when
+// KeyValueStoreManagerImpl::DoFactoryReset() is called.
+#define NAMESPACE_FACTORY CHIP_DEVICE_CONFIG_SETTINGS_KEY "-fct/"
+#define NAMESPACE_CONFIG CHIP_DEVICE_CONFIG_SETTINGS_KEY "/cfg/"
 #define NAMESPACE_COUNTERS CHIP_DEVICE_CONFIG_SETTINGS_KEY "/ctr/"
-// clang-format on
 
 // Keys stored in the chip factory nam
 const ZephyrConfig::Key ZephyrConfig::kConfigKey_SerialNum           = CONFIG_KEY(NAMESPACE_FACTORY "serial-num");