64bit only Android

BoardConfig disables:

TARGET_2ND_ARCH := arm
TARGET_2ND_ARCH_VARIANT := armv8-a
TARGET_2ND_CPU_ABI := armeabi-v7a
TARGET_2ND_CPU_ABI2 := armeabi

so build.prop will be affected (ro.product.cpu.abilist{,32})

differences on core_64_bit.mk vs core_64_bit_only.mk https://android.googlesource.com/platform/build/+/master/target/product/core_64_bit.mk https://android.googlesource.com/platform/build/+/master/target/product/core_64_bit_only.mk

PRODUCT_VENDOR_PROPERTIES += ro.zygote=zygote64
PRODUCT_VENDOR_PROPERTIES += dalvik.vm.dex2oat64.enabled=true

and disabling init.zygote64_32.rc