qcacld-3.0: Don't disable roaming when STA connect with bssid
Issue analysis:
On original android Settings wifi UI, only ssid shows, several
bssid of same ssid is merged as 1 item on wifi list, user can't
select bssid but ssid.
On some special apps, all AP are shown by bssid on UI, 2 bssid
of same ssid isn't merged, show as 2 items on wifi list, once
user selects 1 item by click, bssid is set.
When connect with bssid, wpa supplicant will disable roaming,
driver will disable roaming offload scan and btm offload too.
In 11K roaming. when AP requires 1 connected STA to roam,
btm request is sent to wpa supplicant, but wpa supplicant will
send back btm response with reject reason 7:
WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES. AP may kickout STA DUT.
Fix:
APPs usually don't care bssid, even connect with bssid, LFR3/2
roaming should keep enabled and btm offloaded to F/W. F/W will
handle btm req and send btm resp for 11K roaming.
If one special APP wants to fix on one bssid, it can call
vendor special API to disable roaming:
QCA_NL80211_VENDOR_SUBCMD_ROAMING.
wlan_hdd_cfg80211_set_fast_roaming is called in driver to
disable LFR3/2 and disable btm offload.
AP roaming decision priority is higher than STA, even STA
disabled roaming, refuse roaming after got btm req from AP, AP
can kickout STA for load balance etc.
Change-Id: I498547be7f26392ddd110585d0475b16a4ec8d5c
CRs-Fixed: 2413272
Jianmin Zhu