mmc: Use logging instead of pr_err()

mmc: Use logging instead of pr_err()

Use the log subsystem instead of dev, to avoid including function names
in the code.

The CONFIG_LOGF_FUNC option can be used to enable the function name.

Update 'enhanced size' to use hex since this is the U-Boot default and
more natural for the large numbers involved.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>