Move HideNonSystemOverlayMixin to SettingsLib

To be re-used by settings applications for other form factors.

Bug: 184967544
Test: make RunSettingsLibRoboTests -j40
ROBOTEST_FILTER=com.android.settingslib.core.lifecycle

Change-Id: I749dbd3f24bf77453d3ecc5d4374d11656498850
2 files changed