It's not necessary to hold the RTNL across color change
requests, since all the inner locking needs only the
wiphy mutex which we already hold as well.

Fixes: 0d2ab3ae ("nl80211: add support for BSS coloring")
Link: https://lore.kernel.org/r/20220414140402.32e03e8c261b.I5e7dc6bc563a129b938c43298da6bb4e812400a5@changeidSigned-off-by: NJohannes Berg <johannes.berg@intel.com>