hostapd: backport ignoring 4addr mode enabling error

hostapd: backport ignoring 4addr mode enabling error

This is a backport of the upstream commit 58bbbb598144 ("nl80211: Ignore
4addr mode enabling error if it was already enabled").

 nl80211_set_4addr_mode() could fail when trying to enable 4addr mode on
 an interface that is in a bridge and has 4addr mode already enabled.
 This operation would not have been necessary in the first place and this
 failure results in disconnecting, e.g., when roaming from one backhaul
 BSS to another BSS with Multi AP.

 Avoid this issue by ignoring the nl80211 command failure in the case
 where 4addr mode is being enabled while it has already been enabled.

Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>
[bump PKG_RELEASE, more verbose commit description]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit fb860b4e418c28a0f388f215e5acce103dcee1bf)