Remove unused art-boot-image and support for prebuilt_boot_image am: 220d126f90 am: 287c9d229f

Original change: https://android-review.googlesource.com/c/platform/prebuilts/module_sdk/art/+/1683864

Change-Id: Ia8076849e95abb3ee59fe5c43ba2933559ff5241
tree: 677075a5a45aefa5a63ed54ab68d67f324eb3c84
  1. current/
  2. Android.bp
  3. METADATA
  4. SoongConfig.bp