net80211: (v)ht: use macros at hand

[bz]

Summary

Rather than duplicating the manual logic here and leaving a comment,
use the self-explanatory macros we already have.

No functional changes intended.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

[bz]

Note: I believe the logic here needs to be reversed and we need to check for 80P80 first. (otherwise we'll never hit the else if case). If anyone agrees with me I'll open another review for that once this is in.
But maybe that's my LinuxKPI way of thinking currently as 80P80 also is considered 160Mhz width there?

[adrian]

yeah, I think so too. Let's do that once we land this.