Adds device tree bindings for the focaltech ft5336 touch panel
controller, which will be used on several i.mx rt evk boards.
Moves address-cells and size-cells properties from the base kscan
bindings to the specific microchip,xec bindings since they are not
required for the ft5336.
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>