HID: holtek-mouse: use module_hid_driver() to simplify the code

module_hid_driver() makes the code simpler by eliminating
boilerplate code.

Reported-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>