feat(ff-a): introduce count flag to ffa_partition_info_get

The partition count flag controls whether to return partition
info descriptors on a call to FFA_PARTITION_INFO_GET. This
patch introduces this functionality.

Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: Ib4a13c10e107daf726e5d6ec0ce6bd0d451c1b0f
diff --git a/src/arch/aarch64/hypervisor/handler.c b/src/arch/aarch64/hypervisor/handler.c
index 9bedee8..e3dcf2b 100644
--- a/src/arch/aarch64/hypervisor/handler.c
+++ b/src/arch/aarch64/hypervisor/handler.c
@@ -492,7 +492,7 @@
 
 		ffa_uuid_init(args->arg1, args->arg2, args->arg3, args->arg4,
 			      &uuid);
-		*args = api_ffa_partition_info_get(current, &uuid);
+		*args = api_ffa_partition_info_get(current, &uuid, args->arg5);
 		return true;
 	}
 	case FFA_ID_GET_32: