docs(maintainers): update Corstone-1000 maintainers

* Add new maintainers: Hugues Kamba Mpiana
* Remove maintainers: Xueliang Zhong
* Update contact information for existing maintainers

Change-Id: Ie4b7e7a1a179e3bf6f8d8e6c8e7ff0ad788e9f8f
Signed-off-by: Hugues Kamba-Mpiana <hugues.kambampiana@arm.com>
1 file changed