[nrf fromlist] samples: 802154_rpmsg: Add SL fault handler

This commit adds the nRF IEEE 802.15.4 Service Layer Fault Handler
to the 802154_rpmsg sample.

Signed-off-by: Czeslaw Makarski <Czeslaw.Makarski@nordicsemi.no>

Author: czeslawmakarski

samples/boards/nrf/ieee802154/802154_rpmsg/src/main.c

@@ -14,3 +14,8 @@ void nrf_802154_serialization_error(const nrf_802154_ser_err_data_t *err)
 	(void)err;
 	__ASSERT(false, "802.15.4 serialization error");
 }
+
+void nrf_802154_sl_fault_handler(uint32_t id, int32_t line, const char *err)
+{
+	__ASSERT(false, "module_id: %u, line: %d, %s", id, line, err);
+}