Read and cache features when user switches

Bug: 163830899
Test: Verified feature is stored to secure setting.

1. Flashed device to QDA release build
2. Verified require_attention was being reported as 1
3. Flashed to most recent change, verified require_attention setting
was upated to 0.

Change-Id: Ibb1fe6ee3d2e6674b4e335341a3278d2cf0f61b0
Merged-In: I0187e27b641edf0836fa187530cb2a193082fe5d