LinuxKPI: 802.11: compile in VHT compat code by default

Compile in the VHT compat code by default even though no one will make
use of it yet.

Sponsored by: The FreeBSD Foundation
Tested with: iwlwifi AX210 (NOHT, HT20, HT40, VHT20, VHT40, VHT80)

(cherry picked from commit 2c44f1ff6935e93f7774e526f2f1ab0a2812eab5)