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
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