Extend ffa service location to support interface id

To support multiple services co-located in a single SP, the
service location strategy for locating FFA accessed services
has been extended to provide the interface id as well as the
partition id for a discovered service endpoint.

Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: Idc0ee431dcf0809cdad1d795e85545ea12b79981
3 files changed