RDKEMW-15246 : Chrony Enhancements

[sindhu-krishnan]

Integrate Unified NTP convergence time logic with systimemgr

[github-actions]

Code Coverage Summary

                                        Total:|72.1%   798|82.8%  64|    -    0

[Copilot]

Pull request overview

This PR adds an NTP synchronisation monitoring path to systimemgr intended to capture unified NTP convergence timing when Chrony RFC mode is enabled.

Changes:

• Adds a new ntpSyncMonitor thread that polls adjtimex() once per second to detect when the kernel clock becomes NTP-synchronised.
• On sync detection, writes marker/status files (e.g., /tmp/clock-event, /tmp/systimemgr/ntp, /tmp/ntp_status).
• Wires the new thread into the existing SysTimeMgr::run() lifecycle (start + join/detach).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
systimemgr.h	Declares the new NTP sync monitor thread entrypoint and worker method.
systimemgr.cpp	Implements the NTP sync polling loop and integrates the new thread into the run lifecycle.

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[github-actions]

Code Coverage Summary

                                        Total:|71.4%   805|82.8%  64|    -    0

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

[github-actions]

Code Coverage Summary

                                        Total:|71.4%   805|82.8%  64|    -    0

[tdeva14]

LGTM