[SYCL] Align with Linux GPU RT 21.26.20194 (intel#341)

Remove XFAIL in OnlineCompiler/online_compiler_L0.cpp as the issue has been fixed.

Author: yuxianch

SYCL/OnlineCompiler/online_compiler_L0.cpp

@@ -6,8 +6,6 @@
 // RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %level_zero_options %s -o %th.out
 // RUN: %HOST_RUN_PLACEHOLDER %th.out
 
-// The test regressed with GPU 21.23.20043. The fix is coming in next driver.
-// XFAIL: linux
 // This test checks INTEL feature class online_compiler for Level-Zero.
 // All Level-Zero specific code is kept here and the common part that can be
 // re-used by other backends is kept in online_compiler_common.hpp file.