wifi: mt76: mt7915: Emulate chanctx methods.

Looks like this was missed in the initial patch that made
the conversion to the emulated chanctx drivers.

Fixes: commit 0a44dfc ("wifi: mac80211: simplify non-chanctx drivers")

Signed-off-by: Ben Greear <greearb@candelatech.com>

drivers/net/wireless/mediatek/mt76/mt7915/main.c

@@ -1657,6 +1657,10 @@ mt7915_net_fill_forward_path(struct ieee80211_hw *hw,
 #endif
 
 const struct ieee80211_ops mt7915_ops = {
+	.add_chanctx = ieee80211_emulate_add_chanctx,
+	.remove_chanctx = ieee80211_emulate_remove_chanctx,
+	.change_chanctx = ieee80211_emulate_change_chanctx,
+	.switch_vif_chanctx = ieee80211_emulate_switch_vif_chanctx,
 	.tx = mt7915_tx,
 	.start = mt7915_start,
 	.stop = mt7915_stop,