Fix header files used in 802.15.4_RF

"ns_types.h" is not used, but included. Results in build failure when networking
feature is ignored with .mbedignored

"mbed_trace.h" not used.

Author: Deepika

components/802.15.4_RF/stm-s2lp-rf-driver/source/rf_configuration.c

@@ -13,11 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include "ns_types.h"
-#include "rf_configuration.h"
-#include "mbed_trace.h"
 
-#define TRACE_GROUP "rfcf"
+#include "rf_configuration.h"
 
 // Note that F_XO and F_DIG depends on the used clock frequency
 #define F_XO    50000000

components/802.15.4_RF/stm-s2lp-rf-driver/source/rf_configuration.h

@@ -16,6 +16,9 @@
 
 #ifndef RF_CONF_H_
 #define RF_CONF_H_
+
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif