clocksource: Prevent immediate watchdog rerun after a delay

The watchdog rewrite made the clocksource check handle long intervals
between two measurements, but missed that the timer expiry needs to be
rebased after such a delay.

When a watchdog invocation is delayed by more than one interval, adding
WATCHDOG_INTERVAL to the previous expiry leaves the timer expiry in the
past. That causes an immediate second invocation. The resulting short
measurement interval can mark a clocksource unstable.

Cure this by rearming the timer based on jiffies, which places the next
expiry one full watchdog interval into the future.

Fixes: 763aacf86f1b ("clocksource: Rewrite watchdog code completely")
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261026010200.96371-1-kmehltretter@gmail.com
Closes: https://lore.kernel.org/r/20261010065509.72916-1-kmehltretter@gmail.com/

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