mailbox: qcom-cpucp: Mark the irq with IRQF_NO_SUSPEND flag

The qcom-cpucp mailbox irq is expected to function during suspend-resume
cycle particularly when the scmi cpufreq driver can query the current
frequency using the get_level message after the cpus are brought up during
resume. Hence mark the irq with IRQF_NO_SUSPEND flag to fix the do_xfer
failures we see during resume.

Err Logs:
arm-scmi firmware:scmi: timed out in resp(caller:do_xfer+0x164/0x568)
cpufreq: cpufreq_online: ->get() failed

Reported-by: Johan Hovold <[e-mail]>
Closes: https://lore.kernel.org/lkml/[e-mail]/
Fixes: 0e2a9a03106c ("mailbox: Add support for QTI CPUCP mailbox controller")
Signed-off-by: Sibi Sankar <[e-mail]>
Reviewed-by: Konrad Dybcio <[e-mail]>
Tested-by: Johan Hovold <[e-mail]>
Signed-off-by: Jassi Brar <[e-mail]>

drivers/mailbox/qcom-cpucp-mbox.c

···
 		return irq;
 
 	ret = devm_request_irq(dev, irq, qcom_cpucp_mbox_irq_fn,
-			       IRQF_TRIGGER_HIGH, "apss_cpucp_mbox", cpucp);
+			       IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND, "apss_cpucp_mbox", cpucp);
 	if (ret < 0)
 		return dev_err_probe(dev, ret, "Failed to register irq: %d\n", irq);