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

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

Change-Id: I73fdd3c9ae8df4dfd322fb68ec315009d3a75ac8
tree: 677075a5a45aefa5a63ed54ab68d67f324eb3c84
  1. current/
  2. Android.bp
  3. METADATA
  4. SoongConfig.bp