HwBinder.setTrebleTestingOverride

To replace usages of environment variable TREBLE_TESTING_OVERRIDE which
is problematic for some clients using setenv in a multi-threaded
environment.

Bug: 156668058
Test: hidl_test_java
Change-Id: I7f7c51b9cfb01a81941154dc406a599cc6edd151
2 files changed