RAS/CEC: Replace use of system_wq with system_percpu_wq

Switch to using system_percpu_wq because system_wq is going away as part of
a workqueue restructuring.

Currently if a user enqueues a work item using schedule_delayed_work() the
used workqueue is "system_wq" (per-cpu workqueue) while queue_delayed_work()
uses WORK_CPU_UNBOUND (used when a CPU is not specified). The same applies to
schedule_work() that is using system_wq and queue_work(), that makes use of
WORK_CPU_UNBOUND again.

This lack of consistency cannot be addressed without refactoring the API.
For more details see those commits and the Link tag below.

  128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
  930c2ea566af ("workqueue: Add new WQ_PERCPU flag")

  [ bp: Massage commit message. ]

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de

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