Revert "Bug 876637 - Ignore cardstatechange event during callscreen exists."

This reverts commit 14804df5ace99202e86220ba44a07d785151c6be because it crashes SIM unlock.
Revert "Bug 861081 - Use navigator.mozIccManager to access card lock functionality. r=fcampo"

This reverts commit 7b9538bf575e4fe363e97061a710332b3851973e.
Homescreen and notifications redesign