Deprecate mkbootimg_args.json by fully support "--format=mkbootimg" am: 07c6063146 am: de73fd2a36 am: 54e2cc4c57 am: db5515fea9

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/1693414

Change-Id: Ibc73830893762b543dd90bbd3f3e6671497bb645