PCI/hotplug: pnv_php: handle OPAL_PCI_SLOT_OFFLINE power state

When calling pnv_php_set_slot_power_state() with state ==
OPAL_PCI_SLOT_OFFLINE, remove devices from the device tree as if we're
dealing with OPAL_PCI_SLOT_POWER_OFF.

Cc: Gavin Shan <gwshan@linux.vnet.ibm.com>
Cc: linux-pci@vger.kernel.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Acked-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

drivers/pci/hotplug/pnv_php.c

@@ -317,7 +317,7 @@ int pnv_php_set_slot_power_state(struct hotplug_slot *slot,
 		return ret;
 	}
 
-	if (state == OPAL_PCI_SLOT_POWER_OFF)
+	if (state == OPAL_PCI_SLOT_POWER_OFF || state == OPAL_PCI_SLOT_OFFLINE)
 		pnv_php_rmv_devtree(php_slot);
 	else
 		ret = pnv_php_add_devtree(php_slot);