AML: Remove unbundling MediaMetadata in MediaSessionRecord

In order to record a log when MediaMetadata is unparceled in the
system process, MediaMetadata calls Bundle#setDefusable when it
is initialized. In order to avoid unnecessarily making
Bundle#setDefusable a public API, this CL removes the unparceling
instance in MediaSessionRecord by extracting the necessary
information inside MediaSession and sending them to
MediaSessionRecord separately.

Bug: 119789387
Test: Build
Change-Id: I7d44fd05250a291bd8d64850cc3c6f47236f9f62