Wandboard has a SD card slot on the baseboard connected to SDHC1 and a
BCM4329 (Wifi + Bluetooth chip) connected to SDHC2.

Add support for these ports.

While at it, provide the card detect gpio on SDHC3 and also fix indentation on
MX6QDL_PAD_GPIO_0__CCM_CLKO1 hog pin.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>