mmc: dw_mmc: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code, the error value gets printed and real error
from dw_mci_parse_dt() is passed further instead of fixed -EINVAL.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200902193658.20539-10-krzk@kernel.org


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