[nrf fromlist] drivers: ieee802154_nrf5: Use BLE.ADDR instead of FICR to create EUI64.

Upstream PR: zephyrproject-rtos/zephyr#73156

Use BLE.ADDR to create unique (to some extent) EUI64
on nRF54H20 in some cases inside the IEEE 802.15.4 driver.

The amount of EUI64-s available in such a way is very limited (~16 million).
However, currently there does not seem to be another feasible way to
get device identifiers on nRF54H20 (such are kept in SICR, to which the
radio core has no access).

Signed-off-by: Piotr Koziar <piotr.koziar@nordicsemi.no>

Author: piotrkoziar

drivers/ieee802154/ieee802154_nrf5.c

@@ -126,7 +126,11 @@ static void nrf5_get_eui64(uint8_t *mac)
 	mac[index++] = (IEEE802154_NRF5_VENDOR_OUI >> 8) & 0xff;
 	mac[index++] = IEEE802154_NRF5_VENDOR_OUI & 0xff;
 
-#if defined(CONFIG_TRUSTED_EXECUTION_NONSECURE) && defined(NRF_FICR_S)
+#if defined(NRF54H_SERIES)
+	/* Can't access SICR with device id on a radio core. Use BLE.ADDR. */
+	deviceid[0] = NRF_FICR->BLE.ADDR[0];
+	deviceid[1] = NRF_FICR->BLE.ADDR[1];
+#elif defined(CONFIG_TRUSTED_EXECUTION_NONSECURE) && defined(NRF_FICR_S)
 	soc_secure_read_deviceid(deviceid);
 #else
 	deviceid[0] = nrf_ficr_deviceid_get(NRF_FICR, 0);