mmc: atmel-mci: Convert to pinctrl_select_default_state()

Let's move away from using pinctrl_pm_select_default_state() as it's
scheduled for removal and use pinctrl_select_default_state() instead.

Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20191206170821.29711-8-ulf.hansson@linaro.org