Undo CAF Dialer IMS conference changes

* This causes weirdness with the FAB in dialtacts. Get rid of it.
* Squash of the following

Revert "IMS: Enable entry 4G conference call in Dialer"

This reverts commit 76c9726e.

Change-Id: Ic326c817496294a9350c767f5ae3e83d817edd18

Revert "IMS: Fix empty URI list dial after add participant."

This reverts commit daba6492.

Revert "IMS: Fix Edit before call option not working issue"

This reverts commit 2fec8e35.

Revert "IMS: Fix to remove unwanted group conference icon."

This reverts commit d3bbfca9.

Revert "Dialer app changes for IMS"

This reverts commit 8ea43d35.

Change-Id: I187d935394e9a935d199b66b28910a38a248b535