[SYCL] Fix regression in update_host (#15153)
Restores missed context analysis for host pointer update.
Regression is caused by
https://github.com/intel/llvm/commit/3dc75a75b624ae2d3fd2e2335a7c6ee054b75366
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Signed-off-by: Tikhomirova, Kseniya <kseniya.tikhomirova@intel.com>
