p54: use IEEE 802.11e defaults for initialization

This trival one-liner changes the QoS initialization values to match IEEE
802.11e defaults.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>