coresight-etm4x: use trace ids starting 0x1 for ETMs devices

ETM parser expects ETM trace ids starting from 0x1.

This change fixes the start of ETM trace id to make it compatible with
ETM parser.

Change-Id: Icc5c6de317468b845448dae22a447e8b9a82ea54
Signed-off-by: Shashank Mittal <mittals@codeaurora.org>