boards: stm32n6570_dk: add zephyr_h264enc / zephyr_jpegenc labels

Add zephyr_h264enc and zephyr_jpegenc labels on node in order to
be able to use VENC and JPEG codec from samples.

Signed-off-by: Alain Volmat <[email protected]>

Author: Alain Volmat

boards/st/stm32n6570_dk/stm32n6570_dk_common.dtsi

@@ -534,10 +534,10 @@ csi_interface: &dcmipp {
 	};
 };
 
-&venc {
+zephyr_h264enc: &venc {
 	status = "okay";
 };
 
-&jpeg {
+zephyr_jpegenc: &jpeg {
 	status = "okay";
 };