Propagate process labels to PD sessions

On Linux, we use the session label for naming the corresponding Linux
process. When looking up the processes via 'ps', the Genode process
hierarchy becomes immediately visible.

base-linux/include/linux_pd_session/client.h

@@ -35,8 +35,8 @@ namespace Genode {
 		 * Linux-specific extension **
 		 *****************************/
 
-		void start(Capability<Dataspace> binary, Name const &name) {
-			call<Rpc_start>(binary, name); }
+		void start(Capability<Dataspace> binary) {
+			call<Rpc_start>(binary); }
 	};
 }