The Phoronix Test Suite has no built-in support for an easy cross-compiling setup, but it still should be possible with minimal work.
You can build the binaries elsewhere and then transfer the resulting contents to ~/.phoronix-test-suite/installed-tests/. By default all tests are installed to ~/.phoronix-test-suite/installed-tests/ so if you are able to build the ARM-capable binaries elsewhere you can drag and drop them in. Afterwards just use the "run" command to run the benchmarks. You may be prompted though about reinstalling the tests as it may detect you didn't build the binaries on the host system, in which case just ignore the option of reinstalling them.
Let me know if that works for you or if you have any other questions.