Further tuning on Nvidia hardware

[dkhaldi]

@Hitman4Reason, this is the repo to start with and run SYCL joint matrix on Nvidia GPU.
Can you share your address email here as I would like to share other kernels with you by email?

[Hitman4Reason]

@dkhaldi goncalonfcosta@tecnico.ulisboa.pt
Thank you for all the help