sfc: Remove filter table IDs from filter functions

The separation between filter tables is largely an internal detail
and it may be removed in future hardware.  To prepare for that:

- Merge table ID with filter index to make an opaque filter ID
- Wrap efx_filter_table_clear() with a function that clears filters
  from both RX tables, which is all that the current caller requires

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c
index d51a6b1..0f46c1a 100644
--- a/drivers/net/sfc/ethtool.c
+++ b/drivers/net/sfc/ethtool.c
@@ -558,12 +558,8 @@
 	if (rc)
 		return rc;
 
-	if (!(data & ETH_FLAG_NTUPLE)) {
-		efx_filter_table_clear(efx, EFX_FILTER_TABLE_RX_IP,
-				       EFX_FILTER_PRI_MANUAL);
-		efx_filter_table_clear(efx, EFX_FILTER_TABLE_RX_MAC,
-				       EFX_FILTER_PRI_MANUAL);
-	}
+	if (!(data & ETH_FLAG_NTUPLE))
+		efx_filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);
 
 	return 0;
 }