instrumentation tests: Stop passing a generator to posixpath.join()

build/android/pylib/local/device/local_device_instrumentation_test_run.py

Index: build/android/pylib/local/device/local_device_instrumentation_test_run.py
diff --git a/build/android/pylib/local/device/local_device_instrumentation_test_run.py b/build/android/pylib/local/device/local_device_instrumentation_test_run.py
index cae27b3b26462171a406d644e911ef9500bb2ca6..5f5f409ab544bc5c707999c4e962648396a68389 100644
--- a/build/android/pylib/local/device/local_device_instrumentation_test_run.py
+++ b/build/android/pylib/local/device/local_device_instrumentation_test_run.py
@@ -64,7 +64,7 @@ class LocalDeviceInstrumentationTestRun(
       if not d:
         return device_root
       elif isinstance(d, list):
-        return posixpath.join(p if p else device_root for p in d)
+        return posixpath.join(*(p if p else device_root for p in d))
       else:
         return d