feat(fvp): enable external SP images in BL2 config

Currently the list of SP UUIDs loaded by BL2 is hardcoded in the DT.
This is a problem when building a system with other SPs (e.g. from
Trusted Services). This commit implements a workaround to enable adding
SP UUIDs to the list at build time.

Signed-off-by: Balint Dobszay <balint.dobszay@arm.com>
Change-Id: Iff85d3778596d23d777dec458f131bd7a8647031
3 files changed