wifi: mt76: mt7925: drop puncturing handling from BSS change path

wifi: mt76: mt7925: drop puncturing handling from BSS change path

IEEE80211_CHANCTX_CHANGE_PUNCTURING is a channel context change
flag and should not be checked in the BSS change handler, where
the changed mask represents enum ieee80211_bss_change.

Remove the puncturing handling from the BSS path and rely on
mt7925_change_chanctx() to update puncturing configuration.

Fixes: cadebdad959b ("wifi: mt76: mt7925: add EHT preamble puncturing")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/20251216022017.23870-1-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>