spd: trusty: add secure partition and non secure client descriptors

This changes adds FFA endpoint descriptor for both secure and non secure
endpoints. Initializes the endpoint descriptors with Trusty specific
UUID, SP ID and properties.

Signed-off-by: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>
Change-Id: I10d09154b0842d6a59304ed742cb97a528278cca
3 files changed