[SYCL] Adjust XPTI/kernel/content.cpp for https://github.com/intel/llvm/pull/6601

[aelovikov-intel]

intel/llvm#6601 increases number of captured
variable and thus number of kernel arguments for reductions. Modify the
CHECKs accordingly.

[aelovikov-intel]

/verify with intel/llvm#6601

[aelovikov-intel]

The task of interest is Jenkins/llvm-test-suite. The fails are:

L0:

Failed Tests (2):
  SYCL :: Plugin/level_zero_batch_event_status.cpp
  SYCL :: USM/depends_on.cpp

OCL:

Failed Tests (2):
  SYCL :: DiscardEvents/invalid_event_exceptions.cpp
  SYCL :: USM/depends_on.cpp

All seem to be unrelated and noticed on other PRs as well.