qcacmn: Add support for QCA6490

Add the following support for QCA6490:
1. Initialize the qca6490_hal_hw_txrx_ops
2. Initialize the hw_srng_table
3. Attach hal_qca6490_attach

Change-Id: Ic53c520ef804eb4fbe1434c704e9040c83011d3d
CRs-Fixed: 2522133

hal/wifi3.0/hal_generic_api.h

@@ -758,6 +758,9 @@ hal_rx_status_get_tlv_info_generic(void *rx_tlv_hdr, void *ppduinfo,
 			ppdu_info->rx_status.nss = 0;
 #endif
 			break;
+		case TARGET_TYPE_QCA6490:
+			ppdu_info->rx_status.nss = 0;
+			break;
 		default:
 			break;
 		}