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Fix for glupload renegotiation with GLMemory and DMAbuf uploaders

Jan Schmidt requested to merge thaytan/gstreamer:glupload-renegotiation into main 
glupload: Fix caps query with no filter

If no filter caps are provided with a caps query, always
generate a full set of all caps from all upload methods,
not just the configured one. This is needed to handle
renegotiation when dealing with raw sysmem caps - as the upload
method might accept raw sysmem caps, but only the raw data
uploader adds those to the caps query.
Revert "glupload: allow system memory for dmabuf in transform_caps"

This reverts commit f3292dc1561a8d62812c3f1a2bb3de5c5bb6a807.

Only the raw data uploader should add sysmem caps to the
actual caps query, because we want them to be at the
lowest priority. If upstream does select to send raw
caps, then the correct upload method will still
be chosen because the accept_caps implementation
will accept them

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