DO NOT MERGE Validate wallpaper dimension while generating crop

If dimensions of cropped wallpaper image exceed max texture size that
GPU can support, it will cause ImageWallpaper keep crashing
because hwui crashes by invalid operation (0x502).

Bug: 120847476.
Test: Write a custom app to set a 8000x800 bitmap as wallpaper.
Test: The cropped file will be 29600x2960 and make sysui keep crashing.
Test: After applyed this cl, wallpaper will use fallback.
Test: Sysui will not keep crashing any more.
Change-Id: Ifaf2085a0bc94448e49fa2f30066f47310586236