trace: Relax test requirements

We expect the profile and bootstage to agree on timing, but when
running on slow machines there can be a larger descrepency. Increase the
tolerance to fix this.

Fixes: 9cea4797 ("trace: Add a test")
Signed-off-by: Simon Glass <sjg@chromium.org>

test/py/tests/test_trace.py

@@ -299,6 +299,7 @@ def test_trace(u_boot_console):
 
     fg_time = check_flamegraph(cons, fname, proftool, map_fname, trace_fg)
 
-    # Check that bootstage and flamegraph agree to within 10%
+    # Check that bootstage and flamegraph agree to within 30%
+    # This allows for CI being slow to run
     diff = abs(fg_time - dm_f_time)
-    assert diff / dm_f_time < 0.1
+    assert diff / dm_f_time < 0.3