mako: Switch to World APNs list

No longer needed since cdma and gsm apn lists were merged in 413017b

Remove gsm.mk to use the World APNs list

Change-Id: Id9e7fa705f72ade31d2b4b92ea6b3adb3606a9d9
Merge "mako: Switch to World APNs list" into cm-10.2