HID: i2c-hid: change I2C name

no I2C driver has "i2c" in its name. It makes more sense to call this
i2c driver "hid".

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>