irqchip/atmel-aic[5]: Disable interrupts in the irq_pm_shutdown() callbacks

irq_gc_shutdown() calls the irq_pm_shutdown() callbacks from
syscore_shutdown() with interrupts enabled. aic_pm_shutdown() and
aic5_pm_shutdown() take the generic chip lock with raw_spin_lock(), and
irq_gc_eoi() takes the same lock from the interrupt handler. An
interrupt from the chip while the lock is held spins in irq_gc_eoi()
and hangs the reboot.

Lockdep reports this on every reboot of a SAM9X75 Curiosity board:

  WARNING: inconsistent lock state
  inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
  busybox/101 [HC0[0]:SC0[0]:HE1:SE1] takes:
  c1c2b434 (&gc->lock){?.-.}-{2:2}, at: aic5_pm_shutdown+0x34/0xd8
  {IN-HARDIRQ-W} state was registered at:
    ...
    irq_gc_eoi+0x28/0x60
    handle_fasteoi_irq+0x120/0x214
  ...
   aic5_pm_shutdown from irq_gc_shutdown+0x4c/0x58
   irq_gc_shutdown from syscore_shutdown+0x5c/0x9c
   syscore_shutdown from kernel_restart+0x34/0x78
   kernel_restart from sys_reboot+0x180/0x25c

Use the irqsave guard, as
commit 33517881ede7 ("irqchip/brcmstb-l2: Use _irqsave locking variants in non-interrupt code")
did for brcmstb-l2.

Fixes: b1479ebb7720 ("irqchip: atmel-aic: Add atmel AIC/AIC5 drivers")
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Assisted-by: LLM
Reviewed-by: Radu Rendec <radu@rendec.net>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260926004124.88221-1-kmehltretter@gmail.com

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