Remove the ability to install boot images by bootclasspath_fragments. am: 4e9eb1ae am: 4d8badb6

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/soong/+/23208460



Change-Id: If7aa9293e7233f18b6e43ab04e3a3b3a77a72a55
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>