T2447: add configurable kernel boot option 'disable-power-saving'

[c-po]

Lower available CPU C states to a minimum if this option set.
This will set Kernel command-line options intel_idle.max_cstate=0 processor.max_cstate=1.

Change Summary

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T2447

Related PR(s)

• system-option: T5979: Add configurable kernel boot options #2886
• T2447: add configurable kernel boot option 'disable-power-saving' vyos-documentation#1307

Component(s) name

Kernel commandline options

Proposed changes

How to test

• set system option kernel disable-power-saving

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[c-po]

@Mergifyio backport sagitta

[mergify]

backport sagitta

✅ Backports have been created

• #3128 T2447: add configurable kernel boot option 'disable-power-saving' (backport #3093) has been created for branch sagitta