Some modules rely on symlink_preferred_arch to have expected files
present. This change makes apexs include these symlinks.
Test: m com.android.runtime.debug
pushd $(mktemp -d)
mkdir mnt
unzip $OUT/apex/system/com.android.runtime.debug.apex
sudo mount -o loop,ro apex_payload.img mnt
Ensure that mnt/bin/dalvikvm and mnt/bin/dex2oatd both exist and
are symlinks to mnt/bin/dalvikvm64 and mnt/bin/dex2oatd32
respectively.
Bug: 119942078
Bug: 122373634
Bug: 123079311
Change-Id: I47868fbedc5bdd3141a836c488f79e91e0a6ddfe