ARM: dts: imx6q-utilite-pro: i2c1 is muxed

It turns out that the i2c1 adapter is connected to a multiplexer
controlled by a gpio line. The first (default) mux option connects
i2c1 to a bus connected to the already known peripherals. The other
one connects the adapter to the ddc pins of the DVI port.

Signed-off-by: Christopher Spinrath <christopher.spinrath@rwth-aachen.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>