AuthGraph: reduce dependency on authgraph_core

The authgraph_hal library should only depend on libauthgraph_wire, not
on libauthgraph_core, so adjust error processing accordingly.

Test: VtsAidlAuthGraphSessionTest
Bug: 284470121
Change-Id: I48056db6ceeab409d0f165f8e051809129643c6f
2 files changed