run: update trace naming to improve consistency
run: update trace naming to improve consistency

Name of locals used to refer to the different trace formats are not following
a common patter which makes a little bit confusing reading the code.

This patch just rename locals to match a common patter which is:
  trace_<format>, with <format>=[dat,txt,raw]

Signed-off-by: Patrick Bellasi <431c86f368affbc3148c4669fbd465131f7e82cb@arm.com>

joelagnel/trappy,JaviMerino/trappy,bjackman/trappy,JaviMerino/trappy,ARM-software/trappy,ARM-software/trappy,sinkap/trappy,sinkap/trappy,bjackman/trappy,JaviMerino/trappy,ARM-software/trappy,sinkap/trappy,ARM-software/trappy,sinkap/trappy,joelagnel/trappy,bjackman/trappy,bjackman/trappy,joelagnel/trappy,joelagnel/trappy