MediaMetricsService: Parse Spatializer metrics items

Register an action for incoming Spatializer items.

Test: adb shell dumpsys media.metrics - check spatializer log
Bug: 233773341
Merged-In: I97c73fc1001f9ca669255820e48fb32c11489742
Change-Id: I97c73fc1001f9ca669255820e48fb32c11489742
(cherry picked from commit b942702a91d61827280a2f6469054e311b9b7eec)
8 files changed