Merge "Reland "Add rv64 prebuilts directly from the toolchain."" into main am: 381452a359 am: 35bfbee5ea am: 1a7793230a am: 4726cf661f

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

Change-Id: Idbe716c9a3aa2d73cdf55808b8284181b084ae95
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>