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/ds/tests/test_seq_array.c

@@ -52,7 +52,7 @@ int main()
 
   // Find element in the array
   int value = 50;
-  elm_arr_t elm = find_if_arr(&arr, &value, eq_int);
+  elm_arr_t elm = find_if(&arr, &value, eq_int);
   assert(elm.found == true);
   // Check
   assert(*(int*)elm.it == 50);