[automerger skipped] Drop "prebuilt_" prefix when adding libraries to class...

[automerger skipped] Drop "prebuilt_" prefix when adding libraries to class loader context. am: fa20b187 -s ours

am skip reason: Merged-In Icc42533d9915060d7fffda12aa93b9d18dc4f83d with SHA-1 69c1aa94 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/soong/+/15296451

Change-Id: Ib8ba003025ad28fe70275d5041ae4a9017b46f94