test/py: Drop assigning ubman to cons

Now that we have a shorter name, we don't need this sort of thing. Just
use ubman instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/py/tests/test_spl.py b/test/py/tests/test_spl.py
index 6b226c2..4840739 100644
--- a/test/py/tests/test_spl.py
+++ b/test/py/tests/test_spl.py
@@ -33,9 +33,8 @@
         ut_subtest (str): SPL test to be executed (e.g. 'dm platdata_phandle')
     """
     try:
-        cons = ubman
-        cons.restart_uboot_with_flags(['-u', '-k', ut_spl_subtest.split()[1]])
-        output = cons.get_spawn_output().replace('\r', '')
+        ubman.restart_uboot_with_flags(['-u', '-k', ut_spl_subtest.split()[1]])
+        output = ubman.get_spawn_output().replace('\r', '')
         assert 'failures: 0' in output
     finally:
         # Restart afterward in case a non-SPL test is run next. This should not