mmc: debugfs: add card entry for quirks

This is useful to check if a quirk has been applied for the connected
mmc card.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Link: https://lore.kernel.org/r/20240326094215.212930-2-r.czerwinski@pengutronix.de


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>