crypto-client: remove log files on "make clean"

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/psa-client-server/psasim/Makefile b/tests/psa-client-server/psasim/Makefile
index 29afca1..583f1b9 100644
--- a/tests/psa-client-server/psasim/Makefile
+++ b/tests/psa-client-server/psasim/Makefile
@@ -55,4 +55,5 @@
 	rm -rf libpsaclient libpsaserver
 	rm -rf include/psa_manifest
 	rm -f test/psa_service_* test/psa_notify_*
+	rm -r test/*.log