mmc: renesas_sdhi: Use dev_err_probe when getting clock fails

This is to improve deferred probe in this driver and to keep consistent
with an up-to-date handling of a soon to be added second clock.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20211110191610.5664-20-wsa+renesas@sang-engineering.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>