scp: Update maintainers and codeowners

Merged Darryl Green requested to merge github/fork/nicola-mazzucato-arm/update_maintainers into master

Created by: nicola-mazzucato-arm

Change-Id: Id76fb0baf06d406dddb7ecd7c74b2da7a5751be6 Signed-off-by: Nicola Mazzucato nicola.mazzucato@arm.com

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