Need to add the rscv- Known Device Property Prefix

[andreiw]

          Also need to add the rscv- Known Device Property Prefixex

Originally posted by @andreiw in #24 (comment)

Do this by following the directions in https://github.com/UEFI/DSD-Guide/blob/main/dsd-guide.adoc:

The add a prefix to this list and reserve it for your use, please submit a merge request to add a row to the table below. It must include the prefix desired, the organization using the prefix, and a contact email for any questions that may arise.