Unmask operation must be called with interrupt disabled,
on preempt_rt spin_lock_irqsave/spin_unlock_irqrestore
don't disable/enable interrupts, so use raw_* implementation
and change lock variable in struct irq_info from spinlock_t
to raw_spinlock_t
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 25da4618af24 ("xen/events: don't unmask an event channel
when an eoi is pending")
Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>