Revert "Default 'persist.sys.timezone' property to GMT if not set on init."

Telephony code depends on persist.sys.timezone not being set as a signal 
to deduce a timezone from sim card information.

This reverts commit 20e020536ebf999c4acb759960ae6e4bfff6ba67.

Bug: 64056758
Change-Id: I8db204bcffbdb960124b1ae0e02d53b27dd310a4
1 file changed