Read and cache features when user switches

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

1. Flashed flame 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: I0187e27b641edf0836fa187530cb2a193082fe5d
3 files changed