This reverts commit cdf411e82d7e437e5de138492b6e75e5513686ee. It causes pipelines to unnecessarily negotiate to 8 channels. Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1688 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3689>