Remove id from RegionProto object

The region proto object contains an Id, which is assigned to the memory
address of the Region object.

This information is not necessary on winscope traces, remove.

Test: Flash a device. Collect a SF trace. Open trace in winscope. Check
if Id for region objects is removed from the property list

Change-Id: I4f91745d79d9f1812915836e5e7ac3b416c2052a