* Calxeda Highbank 10Gb XGMAC Ethernet

Required properties:
- compatible : Should be "calxeda,hb-xgmac"
- reg : Address and length of the register set for the device
- interrupts : Should contain 3 xgmac interrupts. The 1st is main interrupt.
  The 2nd is pwr mgt interrupt. The 3rd is low power state interrupt.

Example:

ethernet@fff50000 {
        compatible = "calxeda,hb-xgmac";
        reg = <0xfff50000 0x1000>;
        interrupts = <0 77 4  0 78 4  0 79 4>;
};