libs/utils/trace_analysis: ensure a valid range is defined by default
libs/utils/trace_analysis: ensure a valid range is defined by default

When a trace is parse with normalize_time=False, the time axis uses absolute
timestamps collected from the trace.
This patch ensure that the XRange matches the start/end absolute times
specified by the trace.

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

ARM-software/lisa,arnoldlu/lisa,joelagnel/lisa,joelagnel/lisa,mdigiorgio/lisa,JaviMerino/lisa,ARM-software/lisa,arnoldlu/lisa,credp/lisa,mdigiorgio/lisa,credp/lisa,bjackman/lisa,ARM-software/lisa,ARM-software/lisa,credp/lisa,credp/lisa,bjackman/lisa