bridge: fix eapol packet dropping issue

wpa_supplicant would receive EAPOL packet to start 802.1x session even if
its wireless STA interface enslaved in a bridge is disabled.

Change-Id: I4e3f786049a19c5bc7aacdc0528b0099744e8674
Signed-off-by: Zhu Ken <guigenz@codeaurora.org>
Signed-off-by: Pooventhiran G <pooventh@codeaurora.org>