[SYCL][E2E] Enable Clock/clock.cpp in spirv-be (#20545)

llvm/llvm-project#160147 enables support.

Author: KornevNikita

sycl/test-e2e/Clock/clock.cpp

@@ -3,8 +3,6 @@
 // RUN: %{build} -o %t.out
 // RUN: %{run} %t.out
 
-// UNSUPPORTED: spirv-backend
-// UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/20146
 // UNSUPPORTED: target-native_cpu
 // UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/20142