rename find_if_arr -> find_if to avoid name clashes

In a later commit, we will use find_if in L2. In the case of building
with E2 agent, we link e2_agent which comes with its own implementation
of find_if_arr(), which results in a name clash. Rename the OAI
implementation, as nothing uses this, anyway.

common/utils/alg/find.c

@@ -40,7 +40,7 @@ elm_arr_t find_if_arr_it(seq_arr_t* arr, void* start_it, void* end_it, void* val
   return (elm_arr_t){.found = false, .it = NULL};
 }
 
-elm_arr_t find_if_arr(seq_arr_t* arr, void* value, bool (*f)(const void*, const void*))
+elm_arr_t find_if(seq_arr_t* arr, void* value, bool (*f)(const void*, const void*))
 {
   assert(arr != NULL);
   void* start_it = seq_arr_front(arr);