Make PreferenceActivity and PreferenceFragment handle insets properly

This CL makes sure the content of the activity and the fragment won't be
obscured by system window insets.

Bug: 377864165
Bug: 309578419
Flag: com.android.window.flags.enforce_edge_to_edge
Test: atest CtsPreferenceTestCases without
      windowOptOutEdgeToEdgeEnforcement
Change-Id: Iff8cbd93c0ef79bc8aad68ed8459ebda69fa4897