Add user-set boolean to notification permission values.

This change allows for logs and dumps to collect whether any package bans were set by the user or not, and adds that info to the string (logcat) dump. This is also in preparation for adding this field to the PackageNotificationPreferences pulled atom (will be in a future CL).

Bug: 194833441
Test: NotificationmanagerServiceTest, NotificationPermissionMigrationTest, PermissionHelperTest, PreferencesHelperTest
Change-Id: Ic119522a7fedd1869697f320e57813292f4115ce