Werk #18551: Agent freebsd: add chrony section

Component	Checks & agents
Title	Agent freebsd: add chrony section
Date	Aug 6, 2025
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Thanks crpb for contributing!

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