chore(cgroup): fix memory policy build not in linux

[luomingmeng]

What type of PR is this?

Bug fixes

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 15 lines in your changes missing coverage. Please review.

Project coverage is 56.02%. Comparing base (c364e14) to head (d3cc5c5).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/util/cgroup/manager/memory_linux.go	72.72%	10 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #712      +/-   ##
==========================================
+ Coverage   55.91%   56.02%   +0.10%     
==========================================
  Files         575      577       +2     
  Lines       66980    67022      +42     
==========================================
+ Hits        37454    37550      +96     
+ Misses      25548    25470      -78     
- Partials     3978     4002      +24     

Flag	Coverage Δ
unittest	56.02% <72.72%> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.