Merge "Revert "Add rv64 prebuilts directly from the toolchain."" into main am: 9f4bf52ac0

Original change: https://android-review.googlesource.com/c/platform/prebuilts/ndk/+/2676817

Change-Id: I962c6236491439eccb451a83961ad5d2507da748
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>