qcacmn: Initialize only 1 RXDMA DST ring for WCN7850

WCN7850 has only one RXDMA DST ring, as opposed to other
lithium family chipsets, which had 2 RXDMA DST ring.

Refactor the code to pick the number of rxdma destination
rings from CFG context.

Change-Id: I20d475c02690043e969bc7a78605809b8c6814ae
CRs-Fixed: 3084440

wlan_cfg/wlan_cfg.c

@@ -2002,6 +2002,7 @@ wlan_cfg_soc_attach(struct cdp_ctrl_objmgr_psoc *psoc)
 	wlan_cfg_ctx->pkt_capture_mode = cfg_get(psoc, CFG_PKT_CAPTURE_MODE) &
 						 PKT_CAPTURE_MODE_DATA_ONLY;
 #endif
+	wlan_cfg_ctx->num_rxdma_dst_rings_per_pdev = NUM_RXDMA_RINGS_PER_PDEV;
 
 	return wlan_cfg_ctx;
 }