SF: Reset RefreshRateConfigs policy when modes change

When the display modes change the old display policy may
no longer be valid, so we need reset it. This CL also adds
a test for the broken scenario.

Bug: 159590486

Test: atest RefreshRateConfigs
Test: manually 0. device boots in 60hz mode
               1. switch to 50hz from app
               2. disconnect display
               3. reconnect display
               4. verify that SF doesn't crash
Change-Id: Ib935fb4ebce241c4771ffef75b102741e51b96c0