ARM: imx6dl: Add iomux field defines for imx6dl

Start adding iomux field defines for imx6dl. Adds GPR13 fields for
MIPI-CSI2/Parallel video mux selection.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
ARM: imx: Add imx6 video capture platform_data

Adds platform_data for imx6 v4l2 video capture device. Implements
set_video_mux(), which sets the video capture mux in IOMUXC, which
selects between MIPI CSI-2 gasket and Parallel camera sensor
interface.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
gpio: pca953x: Add reset-gpios property

Add optional reset-gpios property. If present, de-assert the
specified reset gpio pin to bring the chip out of reset.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
media: imx6: Add device tree binding documentation

Add device tree binding documentation for i.MX6 media devices.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>