Update preferences to Material Next styling

There should be enough free space to merge this change into S V2.

Test: Settings root, all apps, and about have new style on S
Bug: 187732263
Fix: 188254205, 188012913
Change-Id: I346bbf819f3fe1eb13b47125b53c15baab11e439
Merged-In: I346bbf819f3fe1eb13b47125b53c15baab11e439