mwlwifi: driver version to 10.3.8.0-20181022

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>

package/kernel/mwlwifi/Makefile

@@ -15,9 +15,9 @@ PKG_LICENSE_FILES:=
 
 PKG_SOURCE_URL:=https://github.com/kaloz/mwlwifi
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_DATE:=2018-10-08
-PKG_SOURCE_VERSION:=3520811c99737659de5b65f1e57612a4ae5ad6e6
-PKG_MIRROR_HASH:=8dd116ee939cd5607a6ecae5f8830d159bb96d4600bc3d5a3b14adc35112256f
+PKG_SOURCE_DATE:=2018-10-22
+PKG_SOURCE_VERSION:=fac1da8da63197e0e491eebebe17b37ce1da271f
+PKG_MIRROR_HASH:=95a6a818c1da0839eec789b7f7f6f8b5adf9ed2fc4e7006866c7fb7edde3c76f
 
 PKG_MAINTAINER:=Imre Kaloz <kaloz@openwrt.org>
 PKG_BUILD_PARALLEL:=1