infra: update the manifests for RD-INFRA-2022.08.18 release

The RD-INFRA-2022.08.18 release includes refresh of RD-N2 platform
variants. The pinned manifest files of these platforms have been updated
accordingly for this release.

Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: Ifb7afb2ddcb9e01f8b755b679a5c3d54c0b4928a