Ralink MIPS SoC device tree bindings

1. SoCs

Each device tree must specify a compatible value for the Ralink SoC
it uses in the compatible property of the root node. The compatible
value must be one of the following values:

  ralink,rt2880-soc
  ralink,rt3050-soc
  ralink,rt3052-soc
  ralink,rt3350-soc
  ralink,rt3352-soc
  ralink,rt3883-soc
  ralink,rt5350-soc
  ralink,mt7620a-soc
  ralink,mt7620n-soc
  ralink,mt7628a-soc
  ralink,mt7688a-soc

2. Boards

GARDENA smart Gateway (MT7688)

This board is based on the MediaTek MT7688 and equipped with 128 MiB
of DDR and 8 MiB of flash (SPI NOR) and additional 128MiB SPI NAND
storage.

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Required root node properties:
- compatible = "gardena,smart-gateway-mt7688", "ralink,mt7688a-soc",
		"ralink,mt7628a-soc";