ath6kl: If wow deepsleep pno suspend failure driver will choose cutpower.
in this scenario MMC_PM_KEEP_POWER should be cleared so that mmc will power
off the ar6000
kvalo: remove extra parenthesis
Signed-off-by: Ming Jiang <mjiang@qca.qualcomm.com> Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>