Add aosp_arm64_fullmte target

Test: lunch aosp_arm64_fullmte && m
Test: llvm-readelf -a out/target/product/generic_arm64/system/bin/toybox
  Memtag Android Note:
      Tagging Mode: SYNC
      Heap: Enabled
      Stack: Enabled

Bug: 271768933
Bug: 286415307
Change-Id: I2a1ac78be551d50be9bf6c4ffc8667de4ef7ce8e