Tests for Reference Support.

Bug: 31300815 pointer support
Bug: 31349114 nested types
Bug: 31757611 Parcel ref# cap

Test: `make hidl_test && adb sync && adb shell hidl_test`
      Only works with a kernel patch.

Change-Id: I48351b1bf861a4d2d77f823f7242524156cde1e7