[CES-3378] Enable CFS_BANDWIDTH kernel option

[bryanfoley]

Description

With this PR we enable by default the CFS_BANDWIDTH kernel option, which will allow us to use the SystemD option CPUQuota to limit specific systemd services to only use a maximum percentage of CPU.

This is very useful to ensure that services which are nice to have but not critical to printing, do not claim too much CPU and strangle other processes.

How has this been tested

This feature was tested on NGP systems using a development um-kernel package with CFS_BANDWIDTH enabled and the print_failure or "spaghetti-detection" systemd service file using a CPUQuota=80%, which capped the CPU usage of that service to max 80%:

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