net: hns: fix the unknown phy_nterface_t type error

This patch fix the building error reported by Jiri Pirko <jiri@resnulli.us>

drivers/net/ethernet/hisilicon/hns/hnae.h:465:2: error: unknown type
name 'phy_interface_t'
        phy_interface_t phy_if;
	^
the full build log is on https://lists.01.org/pipermail/kbuild-all.
Signed-off-by: Nhuangdaode <huangdaode@hisilicon.com>
Signed-off-by: Nyankejian <yankejian@huawei.com>
Reviewed-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns/hnae.h

@@ -32,6 +32,7 @@
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/notifier.h>
+#include <linux/phy.h>
 #include <linux/types.h>
 
 #define HNAE_DRIVER_VERSION "1.3.0"