pkg/sysfs: drop discovery flags

[marquiz]

Simplify the code by dropping unused functionality. Effectively, we always used the default flags.

Depends on #1082

[codecov-commenter]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (da26501) 32.11% compared to head (5c6eed8) 32.12%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
pkg/cgroups/cgroupid.go	0.00%	2 Missing ⚠️
pkg/cri/resource-manager/cache/cache.go	0.00%	2 Missing ⚠️
pkg/cri/resource-manager/cache/container.go	0.00%	2 Missing ⚠️
pkg/cri/resource-manager/cache/utils.go	0.00%	1 Missing ⚠️
...ource-manager/control/page-migrate/page-migrate.go	0.00%	1 Missing ⚠️
...esource-manager/policy/builtin/balloons/cputree.go	0.00%	1 Missing ⚠️
pkg/dump/flags.go	0.00%	1 Missing ⚠️
pkg/instrumentation/flags.go	0.00%	1 Missing ⚠️
pkg/log/flags.go	0.00%	1 Missing ⚠️
pkg/log/grpc-logger.go	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1083   +/-   ##
=======================================
  Coverage   32.11%   32.12%           
=======================================
  Files          64       64           
  Lines        9938     9937    -1     
=======================================
  Hits         3192     3192           
+ Misses       6450     6449    -1     
  Partials      296      296           

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[klihub]

LGTM.

The merge-base changed after approval.

[klihub]

LGTM.

[askervin]

LGTM