Fix interface ID parameter setting in sp/ffarpc_caller

When making FFA based RPC calls from one SP to another, the
destination interface ID parameter was not being set correctly.
This change fixes this issue.

Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: Iab520e4c7dc63ee1f5d3bf1bd1de702e4cc6f093
1 file changed