Add hidl_package_root in Bazel There isn't always a current.txt, which makes it a poor proxy for the path. Instead, we'll mimic the existing behavior in Soong. Test: b build //system/tools/hidl/... Test: b build //system/tools/hidl/... --config=android Change-Id: I1ee62d31a1d0f7ae0cd290fcf0916b83a2a12bfb