Fix incomplete Power HAL VTS tests

Add missing Android.mk files and the option to test either binderized
or pass-through implementation.

Bug: 32022775
Test: Built and ran tests.
Change-Id: Ie28a53c92b3512c946416e43e8410ca5bef1274f
Signed-off-by: Connor O'Brien <connoro@google.com>
6 files changed