Revert "squash a1d59bde Do not define struct in place, gcc 9.4 does not seem to like this"

This reverts commit ad16462e.

radio/COMMON/common_lib.h

@@ -181,11 +181,6 @@ typedef enum {
 /*! \brief defines the direction of each symbol. Int values intentional and
  * analogous to FAPI/FHI 7.2 */
 typedef enum { SYMBOL_DIR_DL = 0, SYMBOL_DIR_UL = 1, SYMBOL_DIR_GU = 2 } symbol_direction_t;
-/*! \brief defines the direction of all symbols in one slot, hence defining the
- * format of the entire slot */
-typedef struct slot_format {
-  symbol_direction_t sym_dir[14];
-} slot_format_t;
 /*! \brief Contains information about PRACH and Frame structure, for
  * initialization of split 7 radios which reuses the interface of split 8.
  */
@@ -197,7 +192,9 @@ typedef struct split7_config {
   /*! the TDD period length, if TDD indicated in parent struct */
   int n_tdd_period;
   /*! TDD frame structure, if TDD indicated */
-  slot_format_t slots[160];
+  struct {
+    symbol_direction_t sym_dir[14];
+  } slots[160];
 } split7_config_t;
 
 /*! \brief RF frontend parameters set by application */