ubuntu_ltp_controllers.memcg_usage_in_bytes fails the memory.usage_in_bytes subtest

This was observed on:
- focal:linux-hwe-5.15
- cycle 20230320
- rumford

Logs:

18690 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TINFO: timeout per run is 0h 5m 0s
      18691 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TINFO: set /sys/fs/cgroup/memory/memory.use_hierarchy to 0 failed
      18692 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TINFO: Test memory.usage_in_bytes
      18693 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TINFO: Running memcg_process --mmap-anon -s 4194304
      18694 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TINFO: Warming up pid: 127171
      18695 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TINFO: Process is still here after warm up: 127171
      18696 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TPASS: memory.usage_in_bytes is 4202496-4337664 as expected
      18697 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TBROK: timed out on memory.usage_in_bytes 131072 4202496 4194304
      18698 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TINFO: AppArmor enabled, this may affect test results
      18699 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
      18700 05:38:38 DEBUG| memcg_usage_in_bytes_test 1 TINFO: loaded AppArmor profiles: none
      18701 05:38:38 DEBUG|
      18702 05:38:38 DEBUG| Summary:
      18703 05:38:38 DEBUG| passed 1
      18704 05:38:38 DEBUG| failed 0
      18705 05:38:38 DEBUG| broken 1
      18706 05:38:38 DEBUG| skipped 0
      18707 05:38:38 DEBUG| warnings 0
      18708 05:38:38 DEBUG| INFO: ltp-pan reported some tests FAIL
      18709 05:38:38 DEBUG| LTP Version: 20220527