This reverts commit 18c5fb7c2c, which
disabled the trust agent whitelisting in the sample device admin. Now
that the API is re-enabled, that code should be too.
Bug: 19461292
Change-Id: I85e3b4dcaab500ea9dd4b7e75490ca840ff396be
Adding a new folder in development/samples is not enough to have it be packaged with the SDK. Make sure to edit development/build/sdk.atree to add the sample to the SDK build.