Merge "Reland "Add rv64 prebuilts directly from the toolchain."" into main am: 381452a359 am: 35bfbee5ea

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

Change-Id: Ic0676a7c1fd54fee6387fddb8d5d8cdfd00291d9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>