Merge "Reland "Add rv64 prebuilts directly from the toolchain."" into main am: 381452a359

Original change: https://android-review.googlesource.com/c/platform/prebuilts/ndk/+/2677756

Change-Id: I8c725e6a03eb18d9035b232e6bce7f6cd983384c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>