ath9k: fix tx99 bus error

The hard coded register 0x9864 and 0x9924 are invalid
for ar9300 chips.

Cc: <stable@vger.kernel.org>
Signed-off-by: Miaoqing Pan <miaoqing@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
1 file changed