Altera SoCFPGA ECC Manager
This driver uses the EDAC framework to implement the SOCFPGA ECC Manager.
The ECC Manager counts and corrects single bit errors and counts/handles
double bit errors which are uncorrectable.

Required Properties:
- compatible : Should be "altr,socfpga-ecc-manager"
- #address-cells: must be 1
- #size-cells: must be 1
- ranges : standard definition, should translate from local addresses

Subcomponents:

L2 Cache ECC
Required Properties:
- compatible : Should be "altr,socfpga-l2-ecc"
- reg : Address and size for ECC error interrupt clear registers.
- interrupts : Should be single bit error interrupt, then double bit error
	interrupt. Note the rising edge type.

On Chip RAM ECC
Required Properties:
- compatible : Should be "altr,socfpga-ocram-ecc"
- reg : Address and size for ECC error interrupt clear registers.
- iram : phandle to On-Chip RAM definition.
- interrupts : Should be single bit error interrupt, then double bit error
	interrupt. Note the rising edge type.

Example:

	eccmgr: eccmgr@ffd08140 {
		compatible = "altr,socfpga-ecc-manager";
		#address-cells = <1>;
		#size-cells = <1>;
		ranges;

		l2-ecc@ffd08140 {
			compatible = "altr,socfpga-l2-ecc";
			reg = <0xffd08140 0x4>;
			interrupts = <0 36 1>, <0 37 1>;
		};

		ocram-ecc@ffd08144 {
			compatible = "altr,socfpga-ocram-ecc";
			reg = <0xffd08144 0x4>;
			iram = <&ocram>;
			interrupts = <0 178 1>, <0 179 1>;
		};
	};