spn: add override for Korea

This removes duplicated entry for SKTELECOM

Before	- https://www.dropbox.com/s/0kz0go9yruzppsl/Screenshot_2014-08-05-14-23-37.png
After	- https://www.dropbox.com/s/etmomqysq7l8wh9/Screenshot_2014-08-05-14-25-51.png

Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>

Change-Id: I2176cd88da0b8580e3d31a986f1a2a67581e679c
APN type fix for Telenor Serbia

APN type was set to "default,supl,mms" for both internet and mms. Using CyanogenMod (CM11) it is causing of sending and receiving mms to get stuck forever.

This sets APN type for internet to "default,supl" and "mms" for mms.

Change-Id: Ia2cede31788ab4f76b52d8a2f2ef8a934427169e