Add sycl_ext_oneapi_device_architecture to the supported extensions list

The [sycl_ext_oneapi_device_architecture ](https://github.com/intel/llvm/blob/sycl/sycl/doc/extensions/experimental/sycl_ext_oneapi_device_architecture.asciidoc) is currently experimental extension while actual products such as Pytorch rely on it in the shipped products. Can this extension be promoted from experimental to supported?

See: https://github.com/intel/torch-xpu-ops/blob/release/2.14/src/ATen/native/transformers/xpu/flash_attn/sycltla/mha_bwd.cpp#L75
CC: @gmlueck, @EikanWang, @guangyey

Read sycl/doc/extensions/experimental/sycl_ext_oneapi_device_architecture.asciidoc and inspect how Intel LLVM records experimental versus supported extensions. Check the linked torch-xpu-ops usage for current shipped-product reliance, then identify the supported extensions list and confirm the project’s promotion criteria. Done means the extension is listed as supported with its status represented consistently.

Written by the indexing model from the issue text.