Enable CONFIG_CGROUPS=y where necessary
Related pmbootstrap MR: https://gitlab.com/postmarketOS/pmbootstrap/merge_requests/1830
Most devices already have it enabled (and they wouldn't work well without it), so there are only two kernels that need to be updated.
Untested, but I wouldn't expect any problems caused by enabling this kernel option. (Android has been using cgroups more or less forever...)