[TF-A] Missing properties from cactus dts

Hello Olivier,

Hope you are doing well. As you already know, we are trying to test FF-A, using Cactus, on pre-8.4 Tegra platforms. While doing so, we saw that cactus.dts was missing the following properties

1. maj_ver 2. min_ver 3. spmc_id

plat_spm_core_manifest_load() expects these values in the core manifest file. i.e. cactus.dts.

What would be the right path forward? Do we add these fields to the dts file? Or modify plat_spmd_manifest.c file?

-Varun