ACPI: Add stubs for wakeup handler functions

The commit ddfd9dcf27 ("ACPI: PM: Add acpi_[un]register_wakeup_handler()")
added new functions for drivers to use during the s2idle wakeup path, but
didn't add stubs for when CONFIG_ACPI wasn't set.

Add those stubs in for other drivers to be able to use.

Fixes: ddfd9dcf27 ("ACPI: PM: Add acpi_[un]register_wakeup_handler()")
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20211101014853.6177-1-mario.limonciello@amd.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

include/linux/acpi.h

@@ -974,6 +974,15 @@ static inline int acpi_get_local_address(acpi_handle handle, u32 *addr)
 	return -ENODEV;
 }
 
+static inline int acpi_register_wakeup_handler(int wake_irq,
+	bool (*wakeup)(void *context), void *context)
+{
+	return -ENXIO;
+}
+
+static inline void acpi_unregister_wakeup_handler(
+	bool (*wakeup)(void *context), void *context) { }
+
 #endif	/* !CONFIG_ACPI */
 
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC