Fixed dumpstate_test_fixture so it runs on 64 bits as well.

Test: mmm -j32 frameworks/native/cmds/dumpstate/ && adb sync && \
      adb shell /data/nativetest/dumpstate_test/dumpstate_test && \
      adb shell /data/nativetest64/dumpstate_test/dumpstate_test

Fixes: 64954094

Change-Id: I47fa6a6dcee0c3386c5a9b574583d84b20d30661