Revert "HFP: Add flag for Fall back to SCO connection if eSCO connection is failed"

This reverts commit 6b9c2840.

Reason for revert: https://b.corp.google.com/issues/303168931#comment31

Bug: 303168931
Flag: EXEMPT revert
Test: m com.android.btservices
Change-Id: I698140e828fd6a3a608e26c87da21ffe8a9664bd