Add Bigscreen Beyond Kernel patch for kernels post 6.15

As the title says, this documents and uploads the kernel patch required for the Bigscreen Beyond on kernels post 6.15.
This new patch is my own update to the original patch listed here, due to that the only other reference to it is in my dotfiles, hence why I uploaded it to this repo (if a maintainer prefers, I can update this patch to direct to the files in my dotfiles instead).