LinuxKPI: 802.11: initialize txq

In 5a9a0d7803382321b5f9fff1deae5fb08463cf1a we omitted the initialization
of the per-hw txq settings. Fix this.

Sponsored by: The FreeBSD Foundation
Fixes: 5a9a0d7803382321b5f9fff1deae5fb08463cf1a

(cherry picked from commit a5ae63edd59453f23d51a0cc61922bd3e1e4cce4)