[libc][NFC][Obvious] Fix the benchmarks after the switch to llvm/third-party

Author: Siva Chandra Reddy

libc/benchmarks/LibcBenchmark.cpp

@@ -15,7 +15,7 @@ namespace libc_benchmarks {
 
 void checkRequirements() {
   const auto &CpuInfo = benchmark::CPUInfo::Get();
-  if (CpuInfo.scaling_enabled)
+  if (CpuInfo.scaling == benchmark::CPUInfo::ENABLED)
     report_fatal_error(
         "CPU scaling is enabled, the benchmark real time measurements may be "
         "noisy and will incur extra overhead.");