cm audio: update sounds, add new ones

Change-Id: I6e45ac37b4fa3c3255019929a9f49742f1996de4
Add Lycamobile PT MVNO apn

Per https://jira.cyanogenmod.org/browse/CYAN-797

Patchset #2: Correct MNC
Patchset #3: Remove User/Pass

Change-Id: Ic93f6672d12ef72a9998f5fdb65c04686869b7cc
APN: Update StraightTalk AT&T

Change-Id: If440f08e91581a3b9c63f3f13011ac70c013cea5
Merge "Add Lycamobile PT MVNO apn" into cm-10.1
cm: Include private signing keys if present

Change-Id: Ic96d4d49d821cb03d5318e3e9ad93d02fb92573e
Merge "cm audio: update sounds, add new ones" into cm-10.1
Merge "cm: Include private signing keys if present" into cm-10.1
Merge remote-tracking branch 'CyanogenMod/cm-10.1' into cm-10.1