ART: Add native bridge "support" to run-test

Add detection of a native-bridge device to run-test. Right now it
only recognizes x86+arm (and will only set x86).

In a follow-up, the test runner needs to be restricted to not
run 64-bit tests on such a configuration.

Bug: 109714550
Test: art/test/run-test --dev 001-HelloWorld
Test: art/test/run-test --dev --64 001-HelloWorld
Change-Id: Ib91086745084e3281725e86619811332d0be7054