Skip devices with multiple bits set.

aosp/1399204 added AUDIO_DEVICE_OUT_BLE_SPEAKER whose value is
0x20000001. The buildCommonTypesStructureFile.py didn't cover that kind
of values and it caused audioserver crashed.

This CL skips that kind of devices. A general solution (b/168065706)
should be addressed in the configurable audio policy and parameter
framework.

BUG: 167745916
Test: Check PolicySubsystem-CommonTypes.xml and boot up device.
Change-Id: Id802d37c18c4fd152a84a5a1579390b464c505f1