x86/hpet: irq_pipeline: Harden clocksource for use in oob

While it's slow, has scalability issues, it remains the second-best
clocksource for Linux on x86. If Linux decides that the TSC is not
reliable we will end up here and should avoid bringing the system into
an unstable state.

Suggested-by: Philippe Gerum <rpm@xenomai.org>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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