wl12xx: pass the wake up condition when configuring the wake up event

Changed the function wl12xx_acx_wake_up_conditions() so that it receives an
argument with the actual wake up condition, instead of having
WAKE_UP_EVENT_DTIM_BITMAP hardcoded.  This is needed because we have to use
different conditions in 1271.

Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>