hwmon: (mr75203) Drop unnecessary include file

The driver does not perform any locking and thus does not need to
include mutex.h. Drop the unnecessary include file.

Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/mr75203.c

···
 #include <linux/kstrtox.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
-#include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/regmap.h>