ath9k_htc: Handle IDLE state transition properly

commit 075163bb upstream.

Make sure that a chip reset is done when IDLE is turned
off - this fixes authentication timeouts.

Reported-by: Ignacy Gawedzki <i@lri.fr>
Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>