test/py: Split mark to multiple lines

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>