Broadcom GMAC Ethernet Controller Device Tree Bindings
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Required properties:
 - compatible:	"brcm,bgmac-nsp"
 - reg:		Address and length of the GMAC registers,
		Address and length of the GMAC IDM registers
 - reg-names:	Names of the registers.  Must have both "gmac_base" and
		"idm_base"
 - interrupts:	Interrupt number

Optional properties:
- mac-address:	See ethernet.txt file in the same directory

Examples:

gmac0: ethernet@18022000 {
	compatible = "brcm,bgmac-nsp";
	reg = <0x18022000 0x1000>,
	      <0x18110000 0x1000>;
	reg-names = "gmac_base", "idm_base";
	interrupts = <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
	status = "disabled";
};