HID: logitech-dj: use inlined helpers hid_hw_open/close

Use the inlined helpers hid_hw_open/close instead of direct calls to
->ll_driver->open() and ->ll_driver->close().

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>