Remove dun type APN information for Canada operators
Remove dun type APN information for Canada operators

Tether apn is already set in frameworks/base/core/res/res/values-mcc302-mncXXX.

Bug: 18938116
Change-Id: I98c7097a9920cb79505b9c9d66ae1acfdeff4175

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead