test/py: Split mark to multiple lines

We inconsistently note multiple dependencies today in our tests,
sometimes with a single line that declares multiple and sometimes
multiple single lines.  Current pytest seems to fail on the single line
format so change to multiple declarations.

Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Simon Glass <sjg@chromium.org> [on sandbox]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/test/py/tests/test_mmc_wr.py b/test/py/tests/test_mmc_wr.py
index 8b18781..ab4c579 100644
--- a/test/py/tests/test_mmc_wr.py
+++ b/test/py/tests/test_mmc_wr.py
@@ -35,7 +35,9 @@
 
 """
 
-@pytest.mark.buildconfigspec('cmd_mmc','cmd_memory', 'cmd_random')
+@pytest.mark.buildconfigspec('cmd_mmc')
+@pytest.mark.buildconfigspec('cmd_memory')
+@pytest.mark.buildconfigspec('cmd_random')
 def test_mmc_wr(u_boot_console, env__mmc_wr_config):
     """Test the "mmc write" command.