HF_CLIENT: Upgrade version from 1.6 to 1.7

In HFP client version 1.7, mandatory S4 setting for eSCO
CVSD coding is introduced. S4 setting takes parameters
as maximum latency = 12msec and retransmission effort = 2.

Test:./run_unit_tests.sh net_test_btif_hf_client_service
Test:./run_unit_tests.sh net_test_hf_client_add_record
Bug: 146090794
Tag: #feature

Change-Id: Ia450b4c237f130021511efb4795d4b2a98892cef