dt-bindings: fsl: add imx7ulp system integration module binding

Freescale i.MX7ULP System Integration Module

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The system integration module (SIM) provides system control and chip configuration

registers. In this module, chip revision information is located in JTAG ID register,

and a set of registers have been made available in DGO domain for SW use, with the

objective to maintain its value between system resets.

Required properties:

- compatible:	Should be "fsl,imx7ulp-sim".

- reg:		Specifies base physical address and size of the register sets.

Example:

sim: sim@410a3000 {

	compatible = "fsl,imx7ulp-sim", "syscon";

	reg = <0x410a3000 0x1000>;

};