Add ApiDemos to device-tests as it's needed by JankMicroBenchmarkTests

Bug: 35882476
Test: local test
make -j32 JankMicroBenchmarkTests ApiDemos  && \
tradefed.sh run template/local --template:map test=JankMicroBenchmarkTests \
      --test-tag testname --log-level-display VERBOSE

Change-Id: I6d6eceaaefa1d78656630e950022e3b1636b6f05
1 file changed