nrfx: Add support for new 4Mbit symbols in radio in nRF54L15

There are new symbols for new configuration in nRF54L15.

Signed-off-by: Karol Lasończyk <karol.lasonczyk@nordicsemi.no>

nrfx/hal/nrf_radio.h

@@ -466,6 +466,12 @@ typedef enum
 #endif
 #if defined(RADIO_MODE_MODE_Nrf_4Mbit0_25) || defined(__NRFX_DOXYGEN__)
     NRF_RADIO_MODE_NRF_4MBIT_H_0_25   = RADIO_MODE_MODE_Nrf_4Mbit0_25,      /*!< 4Mbit/s Nordic proprietary radio mode (BT=0.5/h=0.25). */
+#endif
+#if defined(RADIO_MODE_MODE_Nrf_4Mbit_0BT6) || defined(__NRFX_DOXYGEN__)
+    NRF_RADIO_MODE_NRF_4MBIT_BT_0_6   = RADIO_MODE_MODE_Nrf_4Mbit_0BT6,     /*!< 4Mbit/s Nordic proprietary radio mode (BT=0.6/h=0.5). */
+#endif
+#if defined(RADIO_MODE_MODE_Nrf_4Mbit_0BT4) || defined(__NRFX_DOXYGEN__)
+    NRF_RADIO_MODE_NRF_4MBIT_BT_0_4   = RADIO_MODE_MODE_Nrf_4Mbit_0BT4,     /*!< 4Mbit/s Nordic proprietary radio mode (BT=0.4/h=0.5). */
 #endif
     NRF_RADIO_MODE_BLE_1MBIT          = RADIO_MODE_MODE_Ble_1Mbit,          /**< 1 Mbit/s Bluetooth Low Energy. */
 #if defined(RADIO_MODE_MODE_Ble_2Mbit) || defined(__NRFX_DOXYGEN__)