Revert "Remove TrustAgent whitelisting API"

This reverts commit bc4f2ccf6cfd1a512ad907eda2713ea3c4a1755e
and re-enables the API for MNC.

Bug: 19461292
Change-Id: I53b94bacb6a879fcc0598edfc0f3d44a9dd9e84c
3 files changed