Declare activities for factory reset pages

When trying to trigger factory reset from Settings app, it's unexpected
that Settings will get a fatal ActivityNotFoundException, causing
Settings crash. The factory reset pages have changed their launching
way from by SubSettingsLauncher to by startActivity directly. These
activities haven't been declared in AndroidManifest.xml, which caused
this issue.

Fixes: 182144129
Test: rebuild and manual
1) Flash the device with aosp build
2) Navigate to Reset options (Settings -> System -> Reset options)
3) Observe and check if Settings gets crashed

Change-Id: Ia99f269e237d7c84153d4b903cbca14c33835dc1