Ensure ring buf maps have sane max entries values

[rafaelroquetto]

RingBuf map type must be a multiple of the underlying OS page size.

Resolves #1368

[rafaelroquetto]

@gouthamve are you able to test and report back?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.06%. Comparing base (d52d50e) to head (64042d5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1374      +/-   ##
==========================================
+ Coverage   80.94%   81.06%   +0.12%     
==========================================
  Files         147      147              
  Lines       14762    14770       +8     
==========================================
+ Hits        11949    11974      +25     
+ Misses       2230     2212      -18     
- Partials      583      584       +1     

Flag	Coverage Δ
integration-test	58.61% <100.00%> (+0.18%)	⬆️
k8s-integration-test	59.96% <100.00%> (+0.24%)	⬆️
oats-test	34.12% <100.00%> (+0.05%)	⬆️
unittests	51.84% <0.00%> (-0.02%)	⬇️

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[grcevski]

LGTM!