trace: Update test to tolerate different trace-cmd version

Some versions of trace-cmd (or some machines?) show one less dot in the
CPU list.

Signed-off-by: Simon Glass <sjg@chromium.org>

test/py/tests/test_trace.py

@@ -12,7 +12,7 @@ import u_boot_utils as util
 TMPDIR = '/tmp/test_trace'
 
 # Decode a function-graph line
-RE_LINE = re.compile(r'.*0\.\.\.\.\. \s*([0-9.]*): func.*[|](\s*)(\S.*)?([{};])$')
+RE_LINE = re.compile(r'.*0\.\.\.\.\.? \s*([0-9.]*): func.*[|](\s*)(\S.*)?([{};])$')
 
 
 def collect_trace(cons):