Add "modeled" power components

Modeled power components are computed without regard
for power measured with ODPM/rails.

The purpose of this is mostly to support testing
of power models themselves.

Bug: 175644968
Test: mp :BatteryStatsViewer && adb shell am start -n com.android.frameworks.core.batterystatsviewer/.BatteryStatsViewerActivity

Change-Id: Icca6fe6954776baed48b593017abd8c9bab4dfb7