mmc: sdhci_am654: Use dev_err_probe() for mmc_of_parse() return code

Checking phandle references like mmc-pwrseq can result in -EPROBE_DEFER.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20221101105242.2019036-1-matthias.schiffer@ew.tq-group.com


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