net/mlx5: Fix size field in bufferx_reg struct

According to HW spec the field "size" should be 16 bits
in bufferx register.

Fixes: e281682b ("net/mlx5_core: HW data structs/types definitions cleanup")
Signed-off-by: NMohammad Kabat <mohammadkab@nvidia.com>
Reviewed-by: NMoshe Shemesh <moshe@nvidia.com>
Signed-off-by: NSaeed Mahameed <saeedm@nvidia.com>

include/linux/mlx5/mlx5_ifc.h

@@ -9900,8 +9900,8 @@ struct mlx5_ifc_bufferx_reg_bits {
 	u8         reserved_at_0[0x6];
 	u8         lossy[0x1];
 	u8         epsb[0x1];
-	u8         reserved_at_8[0xc];
-	u8         size[0xc];
+	u8         reserved_at_8[0x8];
+	u8         size[0x10];
 
 	u8         xoff_threshold[0x10];
 	u8         xon_threshold[0x10];