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 <[e-mail]>
Signed-off-by: Kevin Hilman <[e-mail]>

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

···
 - 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
···
 		clocks = <&clkc CLKID_EFUSE>;
 		#address-cells = <1>;
 		#size-cells = <1>;
+		secure-monitor = <&sm>;
 
 		sn: sn@14 {
 			reg = <0x14 0x10>;
···
 		bid: bid@46 {
 			reg = <0x46 0x30>;
 		};
+	};
+
+	sm: secure-monitor {
+		compatible = "amlogic,meson-gxbb-sm";
 	};
 
 = Data consumers =