[ARM] Don't sleep in cpufreq code if IRQs are disabled (during resume.)

arch/arm/mach-sa1100/cpu-sa1110.c

@@ -270,8 +270,12 @@ static int sa1110_target(struct cpufreq_policy *policy,
 	 * We wait 20ms to be safe.
 	 */
 	sdram_set_refresh(2);
+	if (!irqs_disabled()) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule_timeout(20 * HZ / 1000);
+	} else {
+		mdelay(20);
+	}
 
 	/*
 	 * Reprogram the DRAM timings with interrupts disabled, and