Aditya Angadi authored Mar 19, 2021 and Thomas Abraham committed Mar 25, 2021

Add initial model startup support for RD-N2 Cfg1 platform. This supports
busybox, distro boot, secure boot and acs tests.

Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>
Change-Id: Ifdd437a826472ba5c35f5f207b95fa7ccd67ad06