Move zygote start after loading persist properties

Currently zygote is started before loading persistent properties which
stops ART honor experiment flags planned landed as persistent
properties.

The original motivation is we would like zygote be started as early as
possible and loading persistent properties taking time, but after fix of
b/64392887 loading persist properties is now only taking 3ms on P18, 6ms
on P16 respectively.

Bug: 114044733
Test: Boot
Change-Id: Ibc118966e975c741ee8ea47091b14d691692bf2c