platform/mellanox: mlxreg-hotplug: Revert "move to use request_irq by IRQF_NO_AUTOEN flag"

It causes mlxreg-hotplug probing failure: request_threaded_irq()
 returns -EINVAL due to true value of condition:
((irqflags & IRQF_SHARED) && (irqflags & IRQF_NO_AUTOEN))
after flag "IRQF_NO_AUTOEN" has been added to:
	err = devm_request_irq(&pdev->dev, priv->irq,
			       mlxreg_hotplug_irq_handler, IRQF_TRIGGER_FALLING
			       | IRQF_SHARED | IRQF_NO_AUTOEN,
			       "mlxreg-hotplug", priv);

This reverts commit bee3ecfe

 ("platform/mellanox: mlxreg-hotplug: move
to use request_irq by IRQF_NO_AUTOEN flag").

Signed-off-by: Mykola Kostenok <c_mykolak@nvidia.com>
Acked-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20210603172827.2599908-1-c_mykolak@nvidia.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>