test/py: mmc: Factor out device selection
Factor out the 'mmc dev' call so it can be recycled by other tests. Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com> Cc: Tom Rini <trini@konsulko.com> Cc: Simon Glass <sjg@chromium.org> Reviewed-by: NSimon Glass <sjg@chromium.org>
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