HID: hid-lg4ff: Fix "undefined reference" build issue with CONFIG_USB disabled

Fix "undefined reference" build issue with CONFIG_USB disabled; make the
driver use generic HID API instead.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>