net80211: in net80211_vap_printf() also use vprintf()

[bz]

Summary

While everything else uses vprintf() and net80211_vap_printf()
vlog() the debug output of wlandebug sessions can be weird.
For consistency use vprintf() everywhere to have homogeneous logging.

Sponosred by: The FreeBSD Foundation
MFC after: 3 days

[emaste]

sys/net80211/ieee80211_freebsd.c

1327

Any reason to keep this commented out?

[bz]

sys/net80211/ieee80211_freebsd.c

1327

Question is whether we want to, at some point, migrate them all to vlog or rather not? See the function below for Adrian's comments left.

I left it as a reminder that there was a problem with it. I had concerns on the previous review.
We need an overall strategy for this (and debug logging, which ideally would go elsewhere... or cease to be printf).

I can remove it though if you want. The problem will stay on the stack in my head.

In some ways this is (and I should add it to the commit message):
Fixes: 0861daf511dc9

[bz]

Rather than leaving the vlog as a reminder, deal with the TODO comment
in net80211_ic_printf() as well and remove the vlog comment from there.