ARM: socfpga: add bindings doc for arria10 fpga manager

Add a device tree bindings document for the SoCFPGA Arria10
FPGA Manager driver.
Signed-off-by: NAlan Tull <atull@opensource.altera.com>
Acked-by: NRob Herring <robh@kernel.org>
Acked-By: NMoritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/fpga/altera-socfpga-a10-fpga-mgr.txt

+Altera SOCFPGA Arria10 FPGA Manager
+
+Required properties:
+- compatible : should contain "altr,socfpga-a10-fpga-mgr"
+- reg        : base address and size for memory mapped io.
+               - The first index is for FPGA manager register access.
+               - The second index is for writing FPGA configuration data.
+- resets     : Phandle and reset specifier for the device's reset.
+- clocks     : Clocks used by the device.
+
+Example:
+
+	fpga_mgr: fpga-mgr@ffd03000 {
+		compatible = "altr,socfpga-a10-fpga-mgr";
+		reg = <0xffd03000 0x100
+		       0xffcfe400 0x20>;
+		clocks = <&l4_mp_clk>;
+		resets = <&rst FPGAMGR_RESET>;
+	};