Fix to run on 32-bit devices.

Change-Id: Id32899df98aa864ceaa62397ad75522c6bf05a84
diff --git a/utils/python/controllers/android_device.py b/utils/python/controllers/android_device.py
index 307b690..aa704fc 100644
--- a/utils/python/controllers/android_device.py
+++ b/utils/python/controllers/android_device.py
@@ -648,7 +648,9 @@
                     "A command to setup the env to start the VTS Agent failed %s",
                     e)
         vts_agent_log_path = os.path.join(self.log_path, "vts_agent.log")
-        for bitness in ['64', '32']:
+
+        bits = ['64', '32'] if self.is64Bit else ['32']
+        for bitness in bits:
             cmd = (
                 'adb -s {s} shell LD_LIBRARY_PATH={path}/{bitness} '
                 '{path}/{bitness}/vts_hal_agent{bitness}'