hwmon: (axi-fan-control) Use hwmon_notify_event

Instead of directly accessing kobj directly from the driver, use the
hwmon notify API.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220308135408.440744-1-nuno.sa@analog.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/axi-fan-control.c

@@ -339,7 +339,8 @@ static irqreturn_t axi_fan_control_irq_handler(int irq, void *data)
 			ctl->update_tacho_params = true;
 		} else {
 			ctl->hw_pwm_req = false;
-			sysfs_notify(&ctl->hdev->kobj, NULL, "pwm1");
+			hwmon_notify_event(ctl->hdev, hwmon_pwm,
+					   hwmon_pwm_input, 0);
 		}
 	}