PENDING: mailbox: omap-mailbox: Remove #ifdef in suspend/resume fxns

LATE_SYSTEM_SLEEP_PM_OPS internally uses pm_sleep_ptr macro which
automatically prevents the suspend/resume callbacks from getting
compiled if CONFIG_PM_SLEEP is disabled. Using a redundant #ifdef guard
with the suspend/resume callbacks throws a compilation error because
pm_sleep_ptr() can no longer find the symbol.

Remove the redundant #ifdef guard on suspend/resume functions.

Fixes: 76fab2f299 ("PENDING: remoteproc: k3: Ensure mailbox is suspended after remoteproc")
Signed-off-by: Beleswar Padhi <b-padhi@ti.com>

drivers/mailbox/omap-mailbox.c

@@ -334,7 +334,6 @@ static const struct mbox_chan_ops omap_mbox_chan_ops = {
 	.shutdown       = omap_mbox_chan_shutdown,
 };
 
-#ifdef CONFIG_PM_SLEEP
 static int omap_mbox_suspend(struct device *dev)
 {
 	struct omap_mbox_device *mdev = dev_get_drvdata(dev);
@@ -376,7 +375,6 @@ static int omap_mbox_resume(struct device *dev)
 
 	return 0;
 }
-#endif
 
 static const struct dev_pm_ops omap_mbox_pm_ops = {
 	LATE_SYSTEM_SLEEP_PM_OPS(omap_mbox_suspend, omap_mbox_resume)