ubuntu_ltp_controllers:cpuset_memory_pressure fails on liux-hwe-5.15

Found with F-hwe-5.15.0-79.86~20.04.2 on ARM64 node with generic-64k kernel.

Test Log:
INFO: Test start time: Fri Aug 4 04:37:08 UTC 2023
COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 796994 -n 796994 -f /tmp/ltp-xMwoPsljDE/alltests -l /dev/null -C /dev/null -T /dev/null
LOG File: /dev/null
FAILED COMMAND File: /dev/null
TCONF COMMAND File: /dev/null
Running tests.......
cpuset_memory_pressure 1 TINFO: CPUs are numbered continuously starting at 0 (0-127)
cpuset_memory_pressure 1 TINFO: Nodes are numbered continuously starting at 0 (0-3)
cpuset_memory_pressure 1 TPASS: Cpuset memory pressure test succeeded.
cpuset_memory_pressure 3 TPASS: Cpuset memory pressure test succeeded.
cpuset_memory_pressure 5 TPASS: Cpuset memory pressure test succeeded.
Killed
cpuset_memory_pressure 7 TPASS: Cpuset memory pressure test succeeded.
cpuset_memory_pressure 9 TFAIL: root group's memory_pressure didn't have memory pressure rate.
Killed
cpuset_memory_pressure 11 TFAIL: root group's memory_pressure didn't have memory pressure rate.
INFO: ltp-pan reported some tests FAIL
LTP Version: 20230516
INFO: Test end time: Fri Aug 4 04:41:52 UTC 2023

And this can be found on F-lowlatency-hwe-5.15.0-79.88~20.04.1 lowlatency-64k as well.