power_supply: tosa_battery: Get rid of irq_to_gpio usage

This commit fixes the following error:

 linux/drivers/power/tosa_battery.c:153:2: error: implicit declaration of
 function 'irq_to_gpio' [-Werror=implicit-function-declaration]

Since 9d08d5d7, irq_to_gpio() is no longer
available but still in use by collie_battery.c. As it's just for a debug
message, just get rid of this call.
Signed-off-by: NAndrea Adami <andrea.adami@gmail.com>
Signed-off-by: NAnton Vorontsov <anton@enomsg.org>

drivers/power/tosa_battery.c

@@ -150,7 +150,7 @@ static void tosa_bat_external_power_changed(struct power_supply *psy)
 
 static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
 {
-	pr_info("tosa_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
+	pr_info("tosa_bat_gpio irq\n");
 	schedule_work(&bat_work);
 	return IRQ_HANDLED;
 }