include: dt-bindings: fix doxygen group for sent.h

do not redefine sent_interface group, but rather add to existing one

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

include/zephyr/dt-bindings/sent/sent.h

@@ -8,9 +8,7 @@
 #define ZEPHYR_INCLUDE_DT_BINDINGS_SENT_H_
 
 /**
- * @brief SENT Interface
- * @defgroup sent_interface SENT Interface
- * @ingroup io_interfaces
+ * @addtogroup sent_interface
  * @{
  */