Add cropping-related methods to WallpaperData

Change visibility of cropping methods using WallpaperDescription to
match the existing ones without WallpaperDescription, and populate
description crop hints from WallpaperData

Bug: 380245309
Bug: 380244842
Flag: android.app.live_wallpaper_content_handling
Test: CTS test included with change
Change-Id: Ia12d73ad4013f724b9c7d839b0d2aee6d9e82fb5