media: dt-bindings: nokia,smia: Fix link-frequencies documentation

The link-frequencies property belongs to the endpoint, not to the node
representing the device.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/devicetree/bindings/media/i2c/nokia,smia.txt

@@ -20,8 +20,6 @@ Mandatory properties
   dependent).
 - clocks: External clock to the sensor
 - clock-frequency: Frequency of the external clock to the sensor
-- link-frequencies: List of allowed data link frequencies. An array of
-  64-bit elements.
 
 
 Optional properties
@@ -39,6 +37,8 @@ Endpoint node mandatory properties
 ----------------------------------
 
 - data-lanes: <1..n>
+- link-frequencies: List of allowed data link frequencies. An array of
+  64-bit elements.
 
 
 Example
@@ -55,11 +55,13 @@ Example
 		clocks = <&omap3_isp 0>;
 		clock-frequency = <9600000>;
 		nokia,nvm-size = <512>; /* 8 * 64 */
-		link-frequencies = /bits/ 64 <199200000 210000000 499200000>;
 		port {
 			smiapp_ep: endpoint {
 				data-lanes = <1 2>;
 				remote-endpoint = <&csi2a_ep>;
+				link-frequencies =
+					/bits/ 64 <199200000 210000000
+						   499200000>;
 			};
 		};
 	};