Change default AVRCP version to 1.4

Poor support for AVRCP 1.6 in many carkits means the default should be 1.4 until we can work out interop for different models.

Bug: 35956792
Test: Connect Phone to Honda Carkit and play music
Change-Id: Ie48ba3f045cca5edda49399d137f2f756be0ff8a