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
160c28c36d