android_build/target/board/generic_x86_64_arm64

The "generic_x86_64" product defines a non-hardware-specific IA target
without a kernel or bootloader.

It can be used to build the entire user-level system, and
will work with the IA version of the emulator,

It is not a product "base class"; no other products inherit
from it or use it in any way.

Third party arm64 to x86_64 translator has to be installed as well