qcacmn: Avoid use of map and unmap API in simple path

Add qdf wrapper for dma_clean_range and avoid use of DMA
map/unmap APIs in Tx. simple fast path.
Gain of ~150 Mbps is observed while running 4 radio traffic.

Change-Id: I0e96bfee43fe810da8c861cb0f4535fb0ba7f6f7

qdf/inc/qdf_nbuf.h

@@ -1133,6 +1133,19 @@ static inline int qdf_nbuf_get_num_frags(qdf_nbuf_t buf)
 	return __qdf_nbuf_get_num_frags(buf);
 }
 
+/**
+ * qdf_nbuf_dma_clean_range() - Clean the specified virtual address range
+ * @buf_start: start address
+ * @buf_end: end address
+ *
+ * Return: none
+ */
+static inline void
+qdf_nbuf_dma_clean_range(const void *buf_start, const void *buf_end)
+{
+	__qdf_nbuf_dma_clean_range(buf_start, buf_end);
+}
+
 /**
  * qdf_nbuf_get_frag_len() - get fragment length
  * @buf: Network buffer