[RESTRICT AUTOMERGE] Add relative address to DeviceProductInfo.

This CL adds a field relativeAddress to DeviceProductInfo which
contains the device address in the display network. For example,
for HDMI connections the field is populated with the physical address.

Bug: 147994746
Test: adb shell dumpsys display
Change-Id: I87d9fd00bd16abc7594dc3f6b6d4e00c8968af07