dt-bindings: mfd: Move mxs-lradc binding document from IIO to MFD

The bindings, which are now used in MFD, need also to be
documented in the MFD binding document.

Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt b/Documentation/devicetree/bindings/mfd/mxs-lradc.txt
similarity index 100%
rename from Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt
rename to Documentation/devicetree/bindings/mfd/mxs-lradc.txt