softdevice_handler: Use TRNG from Cracen

Use the entropy directly from the TRNG peripheral
of Cracen for Softdevice.
This is done because softdevice needs true RNG data
and internally calculates the PRNG data needed for
its operation.

Signed-off-by: Georgios Vasilakis <[email protected]>

Author: Vge0rge

doc/nrf-bm/release_notes/release_notes_changelog.rst

@@ -28,6 +28,7 @@ SoftDevice Handler
 ==================
 
 * Updated the system initialization to initialize on application level.
+* Updated the entropy source to use the Cracen true random number generator instead of the Cracen pseudorandom number generator.
 
 Boards
 ======

subsys/softdevice_handler/nrf_sdh_soc.c

@@ -10,6 +10,7 @@
 #include <nrf_sdh_soc.h>
 #include <nrf_soc.h>
 #include <psa/crypto.h>
+#include <cracen_psa.h>
 #include <zephyr/logging/log.h>
 
 LOG_MODULE_DECLARE(nrf_sdh, CONFIG_NRF_SDH_LOG_LEVEL);
@@ -48,7 +49,7 @@ static void softdevice_rng_seed(void)
 	psa_status_t status;
 	uint8_t seed[SD_RAND_SEED_SIZE];
 
-	status = psa_generate_random(seed, sizeof(seed));
+	status = cracen_get_trng(seed, sizeof(seed));
 	if (status == PSA_SUCCESS) {
 		err = sd_rand_seed_set(seed);
 		memset(seed, 0, sizeof(seed));