6.18: Add Chrontel CH7218 to the VRR PCON whitelist patch

On behalf of Tomasz Pakuła <tomasz.pakula.oficjalny@gmail.com> (https://www.reddit.com/r/linux_gaming/comments/1pkdfcm/comment/ntq8mgx/), this patch enables VRR support on the [Ugreen DP 1.4 to HDMI 2.1 adapter (model 85564, DP134)](https://amzn.eu/d/7VneOi3) by adding it to the VRR PCON whitelist. That adapter allows full 4K 120Hz 4:4:4 with VRR with AMD under Linux. See the related merge request at gitlab.freedesktop.org or the following reddit post for additional information: https://gitlab.freedesktop.org/drm/amd/-/issues/4773 https://www.reddit.com/r/linux_gaming/comments/1pkdfcm/comment/ntq8mgx/