amd-xgbe: Support for 64-bit management counter registers

Add support for reading all management counter registers as 64-bit
values.  The indication of whether to read the high 32-bits to form
a 64-bit value is indicated in the version data.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe.h b/drivers/net/ethernet/amd/xgbe/xgbe.h
index 160b498..7cbf91b 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe.h
+++ b/drivers/net/ethernet/amd/xgbe/xgbe.h
@@ -804,6 +804,7 @@ struct xgbe_hw_features {
 struct xgbe_version_data {
 	void (*init_function_ptrs_phy_impl)(struct xgbe_phy_if *);
 	enum xgbe_xpcs_access xpcs_access;
+	unsigned int mmc_64bit;
 };
 
 struct xgbe_prv_data {