HID: move to_hid_device() to hid.h

to_hid_device() macro is defined in both hid-lg4ff.c and
hid-logitech-hidpp.c. So I move it to include/linux/hid.h.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-logitech-hidpp.c

@@ -1310,8 +1310,6 @@ struct g920_private_data {
 	u16 range;
 };
 
-#define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
-
 static ssize_t g920_range_show(struct device *dev, struct device_attribute *attr,
 				char *buf)
 {