ARM: dts: imx6qdl-vicut1.dtsi: remove TiWi module

Only the first prototypes had a TiWi module. There is no publicly available
hardware where this module is fitted and there are no plan to produce
any.

Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>