Don't make isSafeMode a field on the Zygote class.

This field is written and read exclusively by the system server,
and should therefore belong to the SystemServer class.

Change-Id: I2708a9a45c0c9cd1a6f563e8cc5844bd8c424bf7
Sometimes property service is slow to respond.

Upon boot-up, telephony service will update the system property for
timezone and send out broadcast.The property service won’t handle
the update immediately if the init process was doing something
time-consuming. Meanwhile StatusBar(one broadcast register) may get
the outdated value by reading from system property, because the
update is not handled yet. Then wrong time will be displayed on
status bar.

Change-Id: Ic29b7940b58e01651da4e0bafa7a88b902164bd0
Signed-off-by: Gao,KunX <kunx.gao@intel.com>
Signed-off-by: Guobin Zhang <guobin.zhang@intel.com>