Revert "Add USSD codes over IMS feature"

Revert "Add USSD codes over IMS feature"

Revert submission 1213006-ussd-ims

Reason for revert: Breaks non-ims calling.
Bug: 150596001
Reverted Changes:
If6cf5bd56:Add USSD codes over IMS feature
I08855fd89:Add USSD codes over IMS feature

Change-Id: I90b038a945190fd1e1a4c3604f022bd81a6ae53c