qcacld-3.0: Return correct high bits of DMA addr

It returns NULL as high bits of DMA addr, which cause Rome platform
broken.

Change-Id: I893f86e6a269145654ae749bd01e7a890f4a1abb
CRs-Fixed: 2264775

core/dp/htt/htt_rx.c

@@ -372,7 +372,7 @@ htt_rx_paddr_mark_high_bits(qdf_dma_addr_t paddr)
 static qdf_dma_addr_t
 htt_rx_paddr_mark_high_bits(qdf_dma_addr_t paddr)
 {
-	return 0;
+	return paddr;
 }
 #endif