LinuxKPI: 802.11: compile in HT compat code by default

Compile in the HT 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 and HT40)

(cherry picked from commit 75d23d882389e1bb011bda37022aaa17c068cbf8)