mac-avcapture: Fix frame rate collection for camera device formats

Some devices will report different framerate ranges for formats that
are identical apart from color primaries. Without taking these into
account, only framerates for one color primary variant would be used
to populate the framerate dropdown in the property view of the camera
source.

Checking for a difference in color primaries when iterating over all
available formats for a device thus requires checking for this
variation and adding the additional frame rate range as well.
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