wl12xx: Restore testmode ABI

commit 3f176494 upstream.

Commit 80900d01 accidently broke
the ABI for testmode commands. Restore the ABI again.

Signed-off-by: Pontus Fuchs <pontus.fuchs@gmail.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>