test: Run binman tests

Update the test script to run the binman tests also.
Signed-off-by: NSimon Glass <sjg@chromium.org>

test/run

@@ -17,6 +17,9 @@ run_test ./test/py/test.py --bd sandbox_spl --build -k \
 # Run tests for the flat DT version of sandbox
 ./test/py/test.py --bd sandbox_flattree --build
 
+PYTHONPATH=build-sandbox_spl/scripts/dtc/pylibfdt run_test \
+	./tools/binman/binman -t
+
 if [ $result == 0 ]; then
 	echo "Tests passed!"
 else