qcacmn: Remove obsolete dmac_inv_range API

Remove obsolete dmac_inv_range API, instead use
qdf_mem_dma_sync_single_for_cpu API where ever required.
https://www.kernel.org/doc/Documentation/DMA-API-HOWTO.txt

Change-Id: I44f14e6c87c1086decc600f59f298b7b8a94bc82
CRs-Fixed: 2215678

qdf/inc/qdf_nbuf.h

@@ -2568,20 +2568,6 @@ bool qdf_nbuf_is_bcast_pkt(qdf_nbuf_t buf)
 	return __qdf_nbuf_is_bcast_pkt(buf);
 }
 
-/**
- * qdf_invalidate_range() - invalidate virtual address range
- * @start: start address of the address range
- * @end: end address of the address range
- *
- * Note that this function does not write back the cache entries.
- *
- * Return: none
- */
-static inline void qdf_invalidate_range(void *start, void *end)
-{
-	__qdf_invalidate_range(start, end);
-}
-
 /**
  * qdf_nbuf_reset_num_frags() - decrement the number of fragments
  * @buf: Network buffer