Support customize the path to lookup for hidl instrumenation libraries.

* This is required by VTS test with profiling: the test could now push the
  profiling library to /data patition and set the path so that the
  system could lookup and load profiling libraries under the customized
  path.
* The custom path is set with property hal.instrumentation.lib.path

Test: manually tested with hidl_test.
Change-Id: Id05594d8f8e55536254400a6a82726093dc69f2f
1 file changed