sycl-exp : unify rope neox/norm

[joeatodd]

• Self Reported Review Complexity:
  • Review Complexity : Low
  • Review Complexity : Medium
  • Review Complexity : High
• I have read the contributing guidelines

This PR updates the SYCL backend as per #7634. It also updates ggml_backend_sycl_supports_op to reflect the fact that:

• rope only works for contiguous arrays
• concat only works for dim==2

[joeatodd]

@ggerganov the target branch for this PR is codeplay/sycl-main, which is a temporary branch which our team has set up to get CI/testing stability while we make a series of performance improvements. Our intention is that these improvements will make it to main soon after, but the stable branch makes it much easier for us to validate our changes in an otherwise fast moving repo.

We decided to open the branch here, rather than in a fork, so that there's more visibility on our work from other llama.cpp developers. However, I can see that this might cause some confusion relating to duplicate PRs etc.

Would you prefer that we take our codeplay/sycl-main branch to a public fork for our team review process, and then raise PRs here when ready for main?

[ggerganov]

@joeatodd No problem at all - feel free to create the branches here for more visibility

[AidanBeltonS]

One comment, otherwise changes seem fine