uboot-phytec

pico-imx6ul: Convert to CONFIG_DM_GPIO

Convert to CONFIG_DM_GPIO.

Also, DM GPIO requires gpio_request() to be called explicitly before
doing any gpio operation, so do as requested.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>