drivers: ieee802154: print serialization error on nRF5340

This commit increases verbosity of serialization error handler for
nRF5340 application core. The handler prints the error code now.

Signed-off-by: Jedrzej Ciupis <jedrzej.ciupis@nordicsemi.no>
diff --git a/drivers/ieee802154/ieee802154_nrf5.c b/drivers/ieee802154/ieee802154_nrf5.c
index 634bf9a..c328ba2 100644
--- a/drivers/ieee802154/ieee802154_nrf5.c
+++ b/drivers/ieee802154/ieee802154_nrf5.c
@@ -1139,9 +1139,9 @@
 }
 
 #if defined(CONFIG_NRF_802154_SER_HOST)
-void nrf_802154_serialization_error(const nrf_802154_ser_err_data_t *p_err)
+void nrf_802154_serialization_error(const nrf_802154_ser_err_data_t *err)
 {
-	__ASSERT(false, "802.15.4 serialization error");
+	__ASSERT(false, "802.15.4 serialization error: %d", err->reason);
 }
 #endif