Revert "wifi: mt76: mt792x: improve monitor interface handling"

Revert "wifi: mt76: mt792x: improve monitor interface handling"

This reverts commit 55e95ce469d0c61041bae48b2ebb7fcbf6d1ba7f.

mt792x drivers don't seem to support multi-radio devices yet.  At least
they don't mess with `struct wiphy_radio` at the moment.

Packet capturing on monitor interface doesn't work after the blamed patch:

  tcpdump -i wls6mon -n -vvv

Revert the NO_VIRTUAL_MONITOR feature for now to resolve the issue.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 55e95ce469d0 ("wifi: mt76: mt792x: improve monitor interface handling")
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Link: https://patch.msgid.link/20251027111843.38975-1-pchelkin@ispras.ru
Signed-off-by: Felix Fietkau <nbd@nbd.name>