config: Add Arm CCA demonstrator config
Brings together a software stack to demonstrate Arm CCA running on FVP in a four-world configuration. Includes TF-A in root world, Hafnium and some demo secure partitions in secure world, RMM in realm world, and Linux in Normal world.
In order to launch realm VMs, the user must bring their own rootfs that contains a realm-aware kvmtool and an RSI-aware guest kernel image.
Signed-off-by: Ryan Roberts ryan.roberts@arm.com