rtl8188eu: bump to latest commit

The rtl8188eu driver wouldn't build due to Linux kernel API changes.

Several fixes for API changes to Linux kernel >=4.11 has been commited
to the repository.

I have bumped to the latest commit and verified that it builds on master
(also successfully built on the 2018.08 branch).

Signed-off-by: William Wennerström <william@willeponken.me>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>