[][kernel][common][hnat][Fix build error in CONFIG_MEDIATEK_NETSYS_V1]

[Description]
Fix build error in CONFIG_MEDIATEK_NETSYS_V1

[Release-log]
N/A


Change-Id: I3ee4906b41e5e05595c536bdf21ba4817011b3bb
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6933960
1 file changed