nvmem: meson-efuse: bindings: Add secure-monitor phandle

Add a new property to link the nvmem driver to the secure-monitor. The
nvmem driver needs to access the secure-monitor to be able to access the
fuses.
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Documentation/devicetree/bindings/nvmem/amlogic-efuse.txt

@@ -4,6 +4,7 @@ Required properties:
 - compatible: should be "amlogic,meson-gxbb-efuse"
 - clocks: phandle to the efuse peripheral clock provided by the
 	  clock controller.
+- secure-monitor: phandle to the secure-monitor node
 
 = Data cells =
 Are child nodes of eFuse, bindings of which as described in
@@ -16,6 +17,7 @@ Example:
 		clocks = <&clkc CLKID_EFUSE>;
 		#address-cells = <1>;
 		#size-cells = <1>;
+		secure-monitor = <&sm>;
 
 		sn: sn@14 {
 			reg = <0x14 0x10>;
@@ -30,6 +32,10 @@ Example:
 		};
 	};
 
+	sm: secure-monitor {
+		compatible = "amlogic,meson-gxbb-sm";
+	};
+
 = Data consumers =
 Are device nodes which consume nvmem data cells.