Revert "opal/accelerator: add synchronize_stream API"

This reverts commit e66e77b.

Author: wenduwan

opal/mca/accelerator/accelerator.h

@@ -175,16 +175,6 @@ typedef int (*opal_accelerator_base_module_create_stream_fn_t)(
 typedef int (*opal_accelerator_base_module_destroy_stream_fn_t)(
     opal_accelerator_stream_t *stream);
 
-/**
- * Wait until a stream's operations are complete
- *
- * @param[IN] stream         Stream to wait for
- *
- * @return                   OPAL_SUCCESS or error status on failure
- */
-typedef int (*opal_accelerator_base_module_synchronize_stream_fn_t)(
-    opal_accelerator_stream_t *stream);
-
 /**
  * Creates an event. An event is a synchronization marker that can be
  * appended to a stream to monitor device progress or synchronize the
@@ -427,7 +417,6 @@ typedef struct {
 
     opal_accelerator_base_module_create_stream_fn_t create_stream;
     opal_accelerator_base_module_destroy_stream_fn_t destroy_stream;
-    opal_accelerator_base_module_synchronize_stream_fn_t synchronize_stream;
     opal_accelerator_base_module_create_event_fn_t create_event;
     opal_accelerator_base_module_record_event_fn_t record_event;
     opal_accelerator_base_module_query_event_fn_t query_event;