Replace the use of xla::OkStatus with absl::OkStatus now that they're the same.
Replace the use of xla::OkStatus with absl::OkStatus now that they're the same.

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/12901 from ROCm:ci_gemm_rewrite_test_fix fe6147564252a291003f9dae1de504052a9296f1
