feat(docs): update maintainer list for neoverse_rd

Add Rohit.Mathew@arm.com to the maintainer list for Neoverse Reference
Design platforms.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I1b8a5714e2707162dd973d9a50215d0a6b622eb1
1 file changed