video: Sort video formats correctly
AV12 should be right after A420 because it is the same format with just
one plane less, instead of being next to I420/NV12 which don't have an
alpha channel.
RGBP should be before GBR because it's the same format except for the
more canonical component order.
See https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/790
which actually checks on the CI if the algorithm defined in
video-format.h is implemented correctly.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1189>
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