Fix broken DUN evaluation logic

Test: as follows
    - built
    - booted
    - flashed
    - runtest frameworks-net passes
Bug: 32163131
Bug: 38152109
Bug: 38186915
Merged-In: Ib9a469b16a598c47b615a15fc7cce420bfe4b8b7
Merged-In: I293b4cd57dcd1968c2b38f4e92e24cc0d2e135a9
Change-Id: Id4803504e825290d62c0b51a2b9bd664dcef30b1
(cherry picked from commit 54f2f370)