kthread: Convert worker lock to raw spinlock

In order to enable the queuing of kthread work items from hardirq context
even when PREEMPT_RT_FULL is enabled, convert the worker spin_lock to a
raw_spin_lock.

This is only acceptable to do because the work performed under the lock is
well-bounded and minimal.

Reported-by: Steffen Trumtrar <[email protected]>
Reported-by: Tim Sander <[email protected]>
Signed-off-by: Julia Cartwright <[email protected]>
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Steffen Trumtrar <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Cc: Guenter Roeck <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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