Enable tethering namespace accessible in Android native level.

Add tethering namespace to sDeviceConfigScopes.

Bug: 202940451
Test: m -j passed
Test: manually verify connecting to wifi after flash
Change-Id: Ic049aac408e356c16ab6414cf40a025f504601e8
Merged-In: If840c79001134d2003cb6f0e03d38b4b4055fb54

services/core/java/com/android/server/am/SettingsToPropertiesMapper.java

@@ -94,6 +94,7 @@ public class SettingsToPropertiesMapper {
         DeviceConfig.NAMESPACE_STATSD_NATIVE,
         DeviceConfig.NAMESPACE_STATSD_NATIVE_BOOT,
         DeviceConfig.NAMESPACE_STORAGE_NATIVE_BOOT,
+        DeviceConfig.NAMESPACE_TETHERING,
         DeviceConfig.NAMESPACE_WINDOW_MANAGER_NATIVE_BOOT,
     };