Resync zygote64 and zygote64_32 rc files.

I noticed that the zygote64 and zygote64_32 files
had gotten slightly out of sync as a result of change
I3aad4b4b1d2f54db9e7ba86db8a655d8552bad0a. Merge the zygote64_32 changes
into zygote64, and to prevent this from happening again, replace the
64-bit zygote declaration in zygote64_32 with an import from zygote64.

Change-Id: I7fcceeb22b722c2164b9acf0b517a32ce34731fd