ARM: dts: imx51-zii-rdu1: fix touchscreen bindings

ARM: dts: imx51-zii-rdu1: fix touchscreen bindings

BugLink: http://bugs.launchpad.net/bugs/1794889
[ Upstream commit 6d3299aef7df7225ecff653feedafb5d1646998b ]

This fixes errors in RDU1 device tree that cause touch screens not
working.

Fixes: ceef0396f367 ("ARM: dts: imx: add ZII RDU1 board")
Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>