support/testing: fix trace-cmd runtime test

The trace-cmd runtime test has a typo and fails with output:

    Traceback (most recent call last):
      File "/build/buildroot/support/testing/tests/package/test_trace_cmd.py", line 53, in test_run
        self.assertEquals(exit_code, 0)
        ^^^^^^^^^^^^^^^^^
    AttributeError: 'TestTraceCmd' object has no attribute 'assertEquals'. Did you mean: 'assertEqual'?

The issue can be reproduced with the command:

    support/testing/run-tests \
        -d dl -o output_test \
        tests.package.test_trace_cmd

This commit fixes the issue by removing the extra 's'.

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 2f507f1da564cce807b809c893fcf2408ca26bfe)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/testing/tests/package/test_trace_cmd.py

@@ -50,5 +50,5 @@ class TestTraceCmd(infra.basetest.BRTest):
         # Check we have occurrences of "kmalloc:" in the trace report.
         cmd = "grep -Fc kmalloc: trace.txt"
         output, exit_code = self.emulator.run(cmd)
-        self.assertEquals(exit_code, 0)
+        self.assertEqual(exit_code, 0)
         self.assertTrue(int(output[0]) > 0)