Add the capability to list bluetooth HFP as emergency capable phone account

Bug: 120810747
Test: when hfp_client_connection_service_support_emergency_call is set
as true, HFP account is listed as Emergency capable in telecom.

Change-Id: If3856b97b02206311d8984eabc85bc5ba66193e1
(cherry picked from commit 5e75bb4d0378d2f7c44c5aa4283bfaeb032048a0)