mmc: dw_mmc: fix err handle of dw_mci_probe

This patch add correct err handle if dw_mci_ctrl_reset
failed while probing.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>