Upgrade 88W8997 firmware to 8.4.0.52.
Removed unnecessary firmware settings.
Added vendor events.
Fixed crash problem when module is removed.
Modified the code to protect tx queues.
Signed-off-by: Jonathan Lancett <j.lancett@ntlworld.com>
[tidy commit message]
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
(backported from 9ac73502405b4d4f110e4901df7d05b7f7bcd781)
ebe02f7a35