Use FourCC instead of CMVideoCodecType in MediaEngineConfigurationFactoryCocoa
<rdar://problem/97803066>
Pull request: https://github.com/WebKit/WebKit/pull/4897
Committed 255091@main (89bd3bf6a815): <https://commits.webkit.org/255091@main> Reviewed commits have been landed. Closing PR #4897 and removing active labels.