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

Remove the ability to install boot images by bootclasspath_fragments. am: b47caccb am: 68b769d7 am: dad2efc3

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2585513



Change-Id: Ic72c91bf515865626911e738c8b0b2146038442a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>