hwmon: (sch5627) Remove unused declaration sch56xx_watchdog_unregister()

Commit 2be5f0d7 ("hwmon: (sch56xx) Use devres functions for watchdog")
removed the implementation but leave declaration.
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Message-ID: <20240816095740.877729-1-yuehaibing@huawei.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/sch56xx-common.h

@@ -22,4 +22,3 @@ int sch56xx_read_virtual_reg12(u16 addr, u16 msb_reg, u16 lsn_reg,
 
 void sch56xx_watchdog_register(struct device *parent, u16 addr, u32 revision,
 			       struct mutex *io_lock, int check_enabled);
-void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data);