ath10k: sdio: add .owner field

sdio_register_driver() doesn't do this for us, unlike (for example)
platform_driver_register(). This is important for helping track
module-to-device relationships.

Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>