net: sun8i-emac: Add a flag for the internal PHY switch

Describe this feature instead of using the SoC ID.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
index f232b8f..36cc249 100644
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -137,6 +137,7 @@
 
 struct emac_variant {
 	enum emac_variant_id	variant;
+	bool			soc_has_internal_phy;
 	bool			support_rmii;
 };
 
@@ -860,7 +861,7 @@
 	if (pdata->phy_interface == PHY_INTERFACE_MODE_NA)
 		return -EINVAL;
 
-	if (priv->variant->variant == H3_EMAC) {
+	if (priv->variant->soc_has_internal_phy) {
 		ret = sun8i_handle_internal_phy(dev, priv);
 		if (ret)
 			return ret;
@@ -906,6 +907,7 @@
 
 static const struct emac_variant emac_variant_h3 = {
 	.variant		= H3_EMAC,
+	.soc_has_internal_phy	= true,
 	.support_rmii		= true,
 };