dt-bindings: arm: add Freescale LS1021A SoC device tree binding

i.MX6q generic board

Required root node properties:

    - compatible = "fsl,imx6q";

Freescale LS1021A Platform Device Tree Bindings

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Required root node compatible properties:

  - compatible = "fsl,ls1021a";

Freescale LS1021A SoC-specific Device Tree Bindings

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Freescale SCFG

  SCFG is the supplemental configuration unit, that provides SoC specific

configuration and status registers for the chip. Such as getting PEX port

status.

  Required properties:

  - compatible: should be "fsl,ls1021a-scfg"

  - reg: should contain base address and length of SCFG memory-mapped registers

Example:

	scfg: scfg@1570000 {

		compatible = "fsl,ls1021a-scfg";

		reg = <0x0 0x1570000 0x0 0x10000>;

	};

Freescale DCFG

  DCFG is the device configuration unit, that provides general purpose

configuration and status for the device. Such as setting the secondary

core start address and release the secondary core from holdoff and startup.

  Required properties:

  - compatible: should be "fsl,ls1021a-dcfg"

  - reg : should contain base address and length of DCFG memory-mapped registers

Example:

	dcfg: dcfg@1ee0000 {

		compatible = "fsl,ls1021a-dcfg";

		reg = <0x0 0x1ee0000 0x0 0x10000>;

	};