Enable VNDK for aosp_arm(64)

This is needed for the system images of aosp_arm(64) products to
be used as their respective GSIs in P, and for also aosp_arm(64)
products to boot with the current GSIs.

Bug: 78255604
Test: Built and booted the following products to home screen
    $ lunch aosp_arm-userdebug; m -j; emulator
    $ lunch aosp_arm64-userdebug; m -j; emulator
    # The system image, both userdebug and user builds, of
    # aosp_arm64 could also boot to home screen and browse
    # the network on a physical device.

Change-Id: I83b79fd4d4e6e522ee78c720fb8c5f6f67ee411b