Revert "Phone: Add headset notification when wired headset plugin"

* This is useless and was -2ed on cm-11.0

This reverts commit e76b54788170b1f04d8d91a0d1f81b4faf2de1f6.

Change-Id: I603b4044473f8b20c4ff661194608ec973c2a276
Merge branch 'cm-12.0' into mkl