gpiolib: acpi: Use METHOD_NAME__AEI macro for acpi_walk_resources

Using the METHOD_NAME__AEI macro instead of using "_AEI" directly.
Signed-off-by: NXiang Yang <xiangyang3@huawei.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/gpio/gpiolib-acpi.c

@@ -512,7 +512,7 @@ void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
 	if (ACPI_FAILURE(status))
 		return;
 
-	acpi_walk_resources(handle, "_AEI",
+	acpi_walk_resources(handle, METHOD_NAME__AEI,
 			    acpi_gpiochip_alloc_event, acpi_gpio);
 
 	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);