HID: sony: initialize sony_dev_list_lock properly

sony_dev_list_lock spinlock (which was introduced in d2d782fc ("HID: sony:
Prevent duplicate controller connections") is not being initialized properly.
Fix that.

Reported-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>