Update media2-exoplayer proguard configuration
Update media2-exoplayer proguard configuration

DownloadActions aren't present due to not including the source modules,
so don't warn about this.

Test: n/a
Bug: 80232248
Change-Id: I2f957c3b99b8e37a8044bffcbc429f02cc133098

AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx