RFR(S): 8078834: [TESTBUG] Tests fails on ARM64 due to unknown hardware

[Sergei Kovalev]

Hello All,

Please review the following change:

Issue: https://bugs.openjdk.java.net/browse/JDK-8078834
Webrev: http://cr.openjdk.java.net/~skovalev/8078834/webrev.00/

Summary: hotspot/test/test_env.sh needs to be update to recognize 
"aarch64" platform.

Testing done: tested locally on ARM64 station.

-- 
With best regards,
Sergei