Using this features, some of the Preference in Power Menu Settings can
change their availability and their summary.
Test: Robotest Settings
Fixes: 157244528
Change-Id: I704438dda181aa6347c3f168ac5ef6bd16148993
The default value for this setting if it doesn't exist is 1.
Test: Robotest PowerMenuPrivacyPreferenceControllerTest
Fixes: 155877682
Change-Id: I9025ea9c4f67492220f9ed67e11a167a65a99ec7
Adds a toggle for Secure.POWER_MENU_LOCKED_SHOW_CONTENT.
The toggle is disabled if cards & passes and controls are off or if the
user does not have a secure lock screen.
Test: manual
Test: PowerMenuPrivacyPreferenceControllerTest
Bug: 152212779
Change-Id: I45134cb9522a81b8e1b520938001488da7f40906
