[nrf toup] drivers: Adding cryptocell as chosen entropy for nRF5340

-Adding cryptocell as zephyr,entropy for nRF5340 in dts

ref: NCSDK-4638

Signed-off-by: Frank Audun Kvamtrø <frank.kvamtro@nordicsemi.no>
(cherry picked from commit 2a9d34d)

dts/arm/nordic/nrf5340_cpuapp.dtsi

@@ -28,6 +28,7 @@
 	};
 
 	chosen {
+		zephyr,entropy = &cryptocell;
 		zephyr,flash-controller = &flash_controller;
 	};