qcacmn: Cleanup fastpath changes

Do following cleanup on fastpath code changes:
1) Do not reap off Tx HIF buffers in Rx handling, instead handle
   reaping in Tx fastpath itself.
2) In ce_per_engine_service_fast check for more Rx packets after
   packet processing.
3) Make stub functions as static inline for non-fastpath enabled case.

Change-Id: If07c4344a424ce13b94128bf28931a24255b661a
CRs-Fixed: 987182

qdf/inc/qdf_mem.h

@@ -276,6 +276,10 @@ void qdf_mem_dma_sync_single_for_device(qdf_device_t osdev,
 					qdf_size_t size,
 					__dma_data_direction direction);
 
+void qdf_mem_dma_sync_single_for_cpu(qdf_device_t osdev,
+					qdf_dma_addr_t bus_addr,
+					qdf_size_t size,
+					__dma_data_direction direction);
 /**
  * qdf_str_len() - returns the length of a string
  * @str: input string