mac80211: Avoid encapsulation of EAPOL frames if OFFLOAD_ENCAP is enabled

EAP frames over the NL80211 control port are encapsulated as 802.11
Native WiFi by default. However, for a vdev operating in 802.3 mode,
if the firmware does not advertise WMI_SERVICE_EAPOL_OVER_NWIFI, it
cannot accept an 802.11 Native WiFi frame.

Allow EAP frames over the NL80211 control port to be passed as 802.3
if the vif has IEEE80211_OFFLOAD_ENCAP_ENABLED set.

Signed-off-by: Nithyanantham Paramasivam <quic_nithp@quicinc.com>
Signed-off-by: Raj Kumar Bhagat <quic_rajkbhag@quicinc.com>
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>