MAINTAINERS: remove non existent input mt git tree

The "INPUT MULTITOUCH (MT) PROTOCOL" entry git tree is not there on
git.kernel.org.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
1 file changed