modules: openthread: fix multiple definition in openthread config
remove `CONFIG_OPENTHREAD_RADIO_LINK_IEEE_802_15_4_ENABLE` from
`openthread-core-zephyr-config.h` which is now handled in
`modules/openthread/CMakeLists.tx`
*/
#define RADIO_CONFIG_SRC_MATCH_EXT_ENTRY_NUM 0
-/**
- * @def OPENTHREAD_CONFIG_RADIO_LINK_IEEE_802_15_4_ENABLE
- *
- * Set to 1 to enable support for IEEE802.15.4 radio link.
- *
- */
-#ifdef CONFIG_OPENTHREAD_RADIO_LINK_IEEE_802_15_4_ENABLE
-#define OPENTHREAD_CONFIG_RADIO_LINK_IEEE_802_15_4_ENABLE \
- CONFIG_OPENTHREAD_RADIO_LINK_IEEE_802_15_4_ENABLE
-#endif /* CONFIG_OPENTHREAD_RADIO_LINK_IEEE_802_15_4_ENABLE */
-
/**
* @def OPENTHREAD_CONFIG_RADIO_LINK_TREL_ENABLE
*
