Revert "MediaSession2: Add playlist parameter supports"

This reverts commit ce07298ecf8fb3520386eb6fcbeac1033da5f362.

Reason for revert: Appears to break master https://android-build.googleplex.com/builds/submitted/4568703/taimen-user/latest/logs/build.log

Change-Id: I08f6af6c91abaadee57e445f6639c424ddb71e0c
6 files changed