test/syscal: Don't skip ClockGettime.CputimeId

We skipped it due to the issue in the golang scheduler
which has been fixed in go1.13.

PiperOrigin-RevId: 283432226

test/syscalls/linux/clock_gettime.cc

@@ -56,11 +56,6 @@ void spin_ns(int64_t ns) {
 
 // Test that CLOCK_PROCESS_CPUTIME_ID is a superset of CLOCK_THREAD_CPUTIME_ID.
 TEST(ClockGettime, CputimeId) {
-  // TODO(b/128871825,golang.org/issue/10958): Test times out when there is a
-  // small number of core because one goroutine starves the others.
-  printf("CPUS: %d\n", std::thread::hardware_concurrency());
-  SKIP_IF(std::thread::hardware_concurrency() <= 2);
-
   constexpr int kNumThreads = 13;  // arbitrary
 
   absl::Duration spin_time = absl::Seconds(1);