PCI: cpcihp: Remove unused .get_power() and .set_power()

The .get_power() and .set_power() function pointers in struct
cpci_hp_controller_ops were declared but never implemented by any
driver.

Thus, to improve code readability and reduce resource usage,
remove these pointers and the code that has never been used.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guilherme Giacomo Simoes <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <[e-mail]>

drivers/pci/hotplug/cpci_hotplug.h

···
 	int (*enable_irq)(void);
 	int (*disable_irq)(void);
 	int (*check_irq)(void *dev_id);
-	u8  (*get_power)(struct slot *slot);
-	int (*set_power)(struct slot *slot, int value);
 };
 
 struct cpci_hp_controller {

drivers/pci/hotplug/cpci_hotplug_core.c

···
 enable_slot(struct hotplug_slot *hotplug_slot)
 {
 	struct slot *slot = to_slot(hotplug_slot);
-	int retval = 0;
 
 	dbg("%s - physical_slot = %s", __func__, slot_name(slot));
 
-	if (controller->ops->set_power)
-		retval = controller->ops->set_power(slot, 1);
-	return retval;
+	return 0;
 }
 
 static int
···
 	}
 	cpci_led_on(slot);
 
-	if (controller->ops->set_power) {
-		retval = controller->ops->set_power(slot, 0);
-		if (retval)
-			goto disable_error;
-	}
-
 	slot->adapter_status = 0;
 
 	if (slot->extracting) {
···
 static u8
 cpci_get_power_status(struct slot *slot)
 {
-	u8 power = 1;
-
-	if (controller->ops->get_power)
-		power = controller->ops->get_power(slot);
-	return power;
+	return 1;
 }
 
 static int