MAINTAINERS: Add TTM reviewers

Add Matthew Auld and Matthew Brost as TTM reviewers

Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona.vetter@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Matthew Auld <matthew.auld@intel.com>
Acked-by: Nirmoy Das <nirmoy.das@intel.com>
Acked-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250206103544.36971-1-thomas.hellstrom@linux.intel.com