iwmc3200wifi: avoid setting default key for 802.1X and RSNA

UMAC only allows us to set default key for WEP and auth type is
not 802.1X or RSNA. This patch fixes iwmc3200wifi for 802.1X with
WEP104.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>