maintainers: Update maintainers for n1sdp, Morello, rd
Created by: nicola-mazzucato-arm
Maintainers for n1sdp, RD platforms and Morello are updated.
Change-Id: I2b5d17ad4ad5e13261fd138489b50c802ff2349e Signed-off-by: Nicola Mazzucato nicola.mazzucato@arm.com