spmi: of: fixup generic SPMI devicetree binding example

The generic SPMI example was missing an equal sign in the assignment
of the #size-cells property.
Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/spmi/spmi.txt

@@ -26,7 +26,7 @@ Each child node must have one and only one 'reg' entry of type SPMI_USID.
 		reg = <...>;
 
 		#address-cells = <2>;
-		#size-cells <0>;
+		#size-cells = <0>;
 
 		child@0 {
 			compatible = "...";