ARM: dts: imx35: add iim module to imx35.dtsi

This is a prerequisite to remove the static mappings for imx35 devicetree
based machines.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>