mmc: cavium: Use '"%s...", __func__' to print function name

Use preferred way '"%s...", __func__' to print function name.

Signed-off-by: Bean Huo <beanhuo@micron.com>
Link: https://lore.kernel.org/r/20210319121357.255176-2-huobean@gmail.com


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