Add a fuzz target to test DNG image parsing in dng_sdk. am: 0c2c0ca07a am: 49be9325f2 am: f4e068b00e am: a139e98c85

Original change: https://android-review.googlesource.com/c/platform/external/dng_sdk/+/1487679

Change-Id: I46c50dbe7f3126cc5c524b65bfd30689bc1c8e1f