Spatializer: Send metrics when not created

For best result normalization, we should also send metrics
when the Spatializer is not created.

This is an empty spatializer create metric which results
in an empty spatializer capabilities atom delivered to statsd.

Test: adb shell dumpsys media.metrics
Bug: 246662756
Change-Id: Ib122c90b1d95c7633913c75b0784d7e7a5f5d4b0