Podcast Player: Add AMP compatibility

[fresatomica]

Steps to reproduce the issue

1. Enable AMP on your site
2. Embed a podcast via Podcast Player Block
3. See error

What I expected

The Player would work correctly.

What happened instead

The Player doesn't appear and clicking on any link will redirect you to the original site where the podcast is hosted.

Screenshots
This was reported by a user here. You can see their screencast here.