ARM: 8966/1: rpc: replace setup_irq() by request_irq()

request_irq() is preferred over setup_irq(). Invocations of setup_irq()
occur after memory allocators are ready.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanosSigned-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

arch/arm/mach-rpc/time.c

@@ -85,11 +85,6 @@ ioc_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction ioc_timer_irq = {
-	.name		= "timer",
-	.handler	= ioc_timer_interrupt
-};
-
 /*
  * Set up timer interrupt.
  */
@@ -97,5 +92,6 @@ void __init ioc_timer_init(void)
 {
 	WARN_ON(clocksource_register_hz(&ioctime_clocksource, RPC_CLOCK_FREQ));
 	ioctime_init();
-	setup_irq(IRQ_TIMER0, &ioc_timer_irq);
+	if (request_irq(IRQ_TIMER0, ioc_timer_interrupt, 0, "timer", NULL))
+		pr_err("Failed to request irq %d (timer)\n", IRQ_TIMER0);
 }