[automerger skipped] Revert "Add support for only starting 64 bit zygote." am: c5ad522f -s ours

am skip reason: Merged-In I7ab0496a402db83e70168d52e5d5911b82a3b06a with SHA-1 3fa3f861 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/19296709



Change-Id: I28bcd39ba0e00861c53ca8a63c72cfabc0765f0e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>