Bug 1884962 - report kProtectionHDCP for the protection mask....

Bug 1884962 - report kProtectionHDCP for the protection mask. r=media-playback-reviewers,padenot, a=dmeehan

According to what Widevine told us, `kProtectionNone` will cause playback
to stop if HDCP_V1 is required. Therefore, we would report HDCP protection
if there is no potential capturing.

Differential Revision: https://phabricator.services.mozilla.com/D207483