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

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



Change-Id: I3acf79fa37df6c6b97de0b79d44a948e1d1a5b5d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>