GitLab

Cleanup DeviceMinimumVersion unit tests

Most of the unit tests only require a single requirement in the policy
value and the code to create such policy value is getting repeated
in all tests. Now, extracting the code to create policy value into a
function.

Bug: 1126163
Change-Id: Ib4bd5743420c9dc962ca37216b9c2e0d9e3adb7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398721Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Saurabh Nijhara <snijhara@google.com>
Cr-Commit-Position: refs/heads/master@{#805278}