fpga dt: bindings for Altera Partial Reconfiguration IP.

Device Tree bindings for Altera Partial Reconfiguration IP.
Signed-off-by: NMatthew Gerlach <matthew.gerlach@linux.intel.com>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NAlan Tull <atull@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/fpga/altera-pr-ip.txt

+Altera Arria10 Partial Reconfiguration IP
+
+Required properties:
+- compatible : should contain "altr,a10-pr-ip"
+- reg        : base address and size for memory mapped io.
+
+Example:
+
+	fpga_mgr: fpga-mgr@ff20c000 {
+		compatible = "altr,a10-pr-ip";
+		reg = <0xff20c000 0x10>;
+	};