mmc: rtsx_usb_sdmmc: Print debug-messages at power-on/off errors

It should be useful to know when we fail to power-on/off a card. Let's
therefore print debug-messages when this happens.

Reviewed-by: Avri Altman <avri.altman@sandisk.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Ricky Wu <ricky_wu@realtek.com>
Link: https://lore.kernel.org/r/20250610111633.504366-3-ulf.hansson@linaro.org