Revert "[telephony] Create a new build flag for the module"

Revert submission 33263850-add_lib_telephony_module

Reason for revert: Likely culprit for b/414984034 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Reverted changes: /q/submissionid:33263850-add_lib_telephony_module

Change-Id: Ia208ae86f3e141dfd5ae74d3fcfdf709700b4cec