mwlwifi: Update to latest commit 20180208

mwlwifi: Update to latest commit 20180208

Changes since last merge into OpenWrt since 2017-12-14:
 - Added debugfs file tx_hist.
 - Added debugfs file fixed_rate.
 - Added debugfs file ba_hist.
 - Modified the way to establish BA stream.
 - Added code to control BF type.
 - Added functions to check/dump dhcp packet.
 - Upgrade 88W8964 firmware to 9.3.2.4.
 - Added debugfs file coredump.
 - Corrected the way to transmit multicast packets.
 - Change driver version to 10.3.4.0-20180118.
 - Corrected the way to get qos control.
 - Assigned broadcast dhcpoffer to another queue.
 - Separated broadcast and multicast packets. Bump to latest commit 20180206

Signed-off-by: Chris Breuer <github@chrisbreuer.de>