powerpc/powermac: IRQF_NO_SUSPEND not IRQF_TIMER for non-timer

Since gpio1 is not a timer, it also should not use IRQF_TIMER.

Similar to commit ba461f09 ("powerpc: Use IRQF_NO_SUSPEND not
IRQF_TIMER for non-timer interrupts").

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>