mwifiex: report wowlan wakeup reasons correctly

It's been observed that wakeup on GTK rekey failure wasn't reported
to cfg80211. This patch corrects the check so that all valid wakeup
reasons are reported.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>