UPSTREAM: wifi: mt76: mt7915: add missing chanctx ops

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

Fixes: 0a44dfc0 ("wifi: mac80211: simplify non-chanctx drivers")
Tested-by: James Courtier-Dutton <james.dutton@gmail.com>
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 2f7cf3b6)

BUG=b:366169724
TEST=Merge patch from upstream

Signed-off-by: Linux Patches Robot <linux-patches-robot@chromeos-missing-patches.google.com.iam.gserviceaccount.com>
Change-Id: Ic49052e43b709f758fb62cc9f1c2f40fe268bcc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5906043


Reviewed-by: Sean Paul <sean@poorly.run>
Reviewed-by: Jintao Lin <jintaolin@chromium.org>
Commit-Queue: Jintao Lin <jintaolin@chromium.org>
Tested-by: Jintao Lin <jintaolin@chromium.org>
Signed-off-by: Mateusz Urbańczyk <urbanczyk@google.com>