Reorganize dbus interface builds The previous structure is failing meson scan-build. Reorganize it to follow the example in hothd and it will now build and pass the scan-build. Google-Bug-Id: 375055000 Change-Id: Icfdf023c78818f2499294642cf25c2be5cdb9378 Signed-off-by: Willy Tu <wltu@google.com>