mmc: dw_mmc: clean up a debug message

The "0x" prefix is redundant when # flag is used.  It prints "0x0x".

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Mårten Lindahl <marten.lindahl@axis.com>
Link: https://lore.kernel.org/r/20211217150348.GD16611@kili


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