MAINTAINERS: Update rtl8180 patterns

rtl8180 files were moved into a subdirectory
by commit 1c740ed2210a0d124674a477ea538468aba47810

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
1 file changed