drivers: ieee802154: extend capabilities
drivers: ieee802154: extend capabilities

This commit extends the capabilities of the nRF IEEE 802.15.4 radio
driver with IEEE802154_HW_TX_SEC capability.

Signed-off-by: Jedrzej Ciupis <6236c7d07f3a915f3607d3bfbdd3ebf209c7426c@nordicsemi.no>

zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr