Wifi/IEEE 802.11

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Activate at least cfg80211 and mac80211.

KERNEL linux-4.19
[*] Networking support  --->
    [*] Wireless  --->
        <M>   cfg80211 - wireless configuration API
        [ ]     nl80211 testmode command
        [ ]     enable developer warnings
        [ ]     cfg80211 certification onus
        [*]     enable powersave by default
        [ ]     cfg80211 DebugFS entries
        [ ]     support CRDA
        [ ]     cfg80211 wireless extensions compatibility
        <M>   Generic IEEE 802.11 Networking Stack (mac80211)
        [*]   Minstrel
        [*]     Minstrel 802.11n support
        [ ]       Minstrel 802.11ac support
              Default rate control algorithm (Minstrel)  --->
        [ ]   Enable mac80211 mesh networking (pre-802.11s) support
        -*-   Enable LED triggers
        [ ]   Export mac80211 internals in DebugFS
        [ ]   Trace all mac80211 debug messages
        [ ]   Select mac80211 debugging features  ----

Minstrel and its 802.11n support is a rate control algorithm. Some wireless drivers might require it enabled.

Important
In case the wireless configuration API (CONFIG_CFG80211) is built into the kernel (<*>) instead as a module (<M>), the driver won't be able to load regulatory.db from /lib/firmware resulting in broken regulatory domain support. Please set CONFIG_CFG80211=m or add regulatory.db and regulatory.db.p7s to CONFIG_EXTRA_FIRMWARE.