[][kernel][common][hnat][Fix BIND entry with DP=0 issue for Wifi Tx]

[Description]
Fix BIND entry with DP=0 issue for Wifi Tx

Without this patch, the PPE entry state could be set to BIND
unexpectedly, adds a check to confirm if the copied entry
state is UNBIND.

[Release-log]
N/A


Change-Id: I49825572617eb804cda18e8f054b9106f26926bb
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8498669
1 file changed