ARM: dts: omap3-igep: add pinmux node for GPIO LED configuration

IGEP boards have a number of LED connected to OMAP or TWL GPIO
lines. The actual wiring is different on each board so each board
DT needs to configure the mux correctly.

Even though it works with the current DT, the kernel complains with:

[2.305023] leds-gpio leds.18: pins are not configured from the driver

Add an empty pinmux_leds_pins pinctrl child node so boards can
override with the correct mux configuration and not depend on
default values for the GPIO LEDs to work.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
ARM: dts: omap3-igep0020: add mux conf for GPIO LEDs

The IGEPv2 has a number of GPIO LED connected to OMAP
pins. Configure these pins as output GPIO.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
ARM: dts: omap3-igep0030: add mux conf for GPIO LED

The IGEP COM Module has a GPIO LED connected to an
OMAP pin. Configure this pin as output GPIO.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>