Fix for luna-sysservice getTimeZoneFromEasData bug

 :Release Notes
 Checking for mandatory parameters available in getTimeZoneFromEasData() api.
 If not available returns error.

 :Detailed Notes
 Returns the error note if the mandatory parameters are not
 specified in getTimeZoneFromEasData() api.

 :Testing Performed
 Compiled locally and tested in device.

 :QA Notes

 :Issues Addressed
 [GF-13470] Issue in com.palm.systemservice/getTimeZoneFromEasData

Open-webOS-DCO-1.0-Signed-off-by: Yasaswini A Y <yasaswini.ay@lge.com>

Change-Id: Ia76c5a6341101b638761c1bbd1655fb9968ce9c7
Reviewed-on: https://g2g.palm.com/3135
Reviewed-by: Build Verification
Reviewed-by: Yasaswini AY <yasaswini.ay@lge.com>
Tested-by: Yasaswini AY <yasaswini.ay@lge.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>