Apply media notification comparison technique on legacy code

This CL has a minor fix, to ensure that the duration for added media
notification is updated.

Flag: com.android.systemui.media_controls_posts_optimization
Bug: 358645640
Test: atest LegacyMediaDataManagerImplTest
Test: checked ui and simple perf.
Change-Id: I2980cb9251636105098d604cf8cc4a617e16eb71