Introduce boolean flags to show/hide battery/memory in App info.

This adds two flags:
config_show_app_info_settings_memory
config_show_app_info_settings_battery

Which when individually set to false, will hide them item from "App
info" which is accessed from clicking on an application in Apps &
notifications -> App info.

Bug: 62379413
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=com.android.settings.applications

Change-Id: Ifb3b644901728dc7ea04d13198abddaa7b230538