[SYCL] Use multi_ptr to clean up deprecated warnings

[AidanBeltonS]

This PR adds a get_pointer() helper function to use the more up-to-date get_multi_ptr.

This cleans up build warnings significantly.

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[HanClinto]

We just fixed the problems that editorconfig is complaining about, so if you update with a rebase or merge with master, you should be able to get a clean bill-of-health on the CI.

[airMeng]

Can you remove the other get_pointer too?

$:~/llama.cpp/ggml$ grep -rI "get_pointer()"
src/ggml-sycl.cpp:                                                                             local_buf_acc.get_pointer());
src/ggml-sycl/dpct/helper.hpp:            : accessor(acc.get_pointer(), in_range) {}
src/ggml-sycl/dpct/helper.hpp:            : accessor(acc.get_pointer(), in_range) {}

[AidanBeltonS]

Can you remove the other get_pointer too?

$:~/llama.cpp/ggml$ grep -rI "get_pointer()"
src/ggml-sycl.cpp:                                                                             local_buf_acc.get_pointer());
src/ggml-sycl/dpct/helper.hpp:            : accessor(acc.get_pointer(), in_range) {}
src/ggml-sycl/dpct/helper.hpp:            : accessor(acc.get_pointer(), in_range) {}

Thanks for pointing these out. I have addressed the src/ggml-sycl.cpp file.

I have not touched the dpct helpers, I am working on a separate PR to clean up some warnings in that. I will include the changes in the second PR, as I want to provide feedback to DPCT and provide an alternative that is independent of llama.cpp.

[joeatodd]

LGTM - thanks @AidanBeltonS, it's a tidy solution

[OuadiElfarouki]

Looks good!