PR #10244: Add sycl build target
PR #10244: Add sycl build target

Imported from GitHub PR https://github.com/openxla/xla/pull/10244

It is a sub PR of https://github.com/openxla/xla/pull/9042.
Then we can build xla with sycl support like: `bazel build --config=sycl xxx`
Copybara import of the project:

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e1bc7ac90f3403a477ba14533dea972de6a2c262 by Sheng, Yang <yang.sheng@intel.com>:

Add sycl build target

Merging this change closes #10244

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10244 from Intel-tensorflow:yang/syclbuild e1bc7ac90f3403a477ba14533dea972de6a2c262
