MAINTAINERS: add a git repo for the Stratix10 Service driver

Add a git repo entry for the Stratix10 Service driver.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Link: https://lore.kernel.org/r/20220223144908.399522-1-dinguyen@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>