infra: update the documentation for RD-INFRA-2022.04.04 release

The RD-INFRA-2022.04.04 release updates the software stack for
RD-N2-Cfg1 reference design platform. The primary change in this release
is to provision support for additional features for the RD-N2-Cfg2
platform.

Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: I029422fd26742814cc9546c89128ec15363bb5f7