minikin_tests was copying its test data to
$OUT/data/DATA/nativetest/minikin_test, and then packaging that with
LOCAL_PICKUP_FILES=$OUT/data/DATA, which would also pick up anything
any other module copyied to $OUT/data/DATA.  $OUT/data/DATA isn't
where the tests expect to find their data, they look in
/data/nativetest/minikin_test.  Copy the files to the intermediates
directory instead.

A future change will install LOCAL_PICKUP_FILES for local builds
to the correct place, so adb sync and
adb shell /data/nativetest/minikin_tests/minikin_tests will run the
tests.

Test: mma -j
Change-Id: I808ce743f51e5ccac711e22821e7e0d7cd94ffdf