Remove the ability to install boot images by bootclasspath_fragments. am: 4e9eb1ae am: 1e73815c

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



Change-Id: I0034742093b2a9d502eb106f010ad83dd6dc2d49
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>