MAINTAINERS: add myself as r8188eu reviewer

MAINTAINERS: add myself as r8188eu reviewer

I was reviewing r8188eu patches for a while, but I am missing some of
them, since I am not in CC list. I want to be CC'ed to help reviewing
and testing more patches.

Acked-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Acked-by: Phillip Potter <phil@philpotter.co.uk>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Link: https://lore.kernel.org/r/d6f6420a0d5ceff6bb50d268023f7d2e117027c5.1654629778.git.paskripkin@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>