amd-xgbe: Prepare for a new PCS register access method

Prepare the code to be able to support accessing of the PCS registers
in a new way, while maintaining the current access method. Provide a
version specific field that indicates the method to use.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/amd/xgbe/xgbe-main.c

@@ -785,6 +785,7 @@ static int xgbe_resume(struct device *dev)
 
 static const struct xgbe_version_data xgbe_v1 = {
 	.init_function_ptrs_phy_impl	= xgbe_init_function_ptrs_phy_v1,
+	.xpcs_access			= XGBE_XPCS_ACCESS_V1,
 };
 
 #ifdef CONFIG_ACPI