[][Add necessary patch and config for NF_HNAT]

[Description]
Add necessary patch and config for NF_HNAT.
	- patch : for resolving IPv6 expand headroom issue
	- config : for enabling NETFILTER by default

[Release-log]
N/A

Change-Id: Iffce551fd9caeb3e36911c2d45e5127a98682d1c
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4712981
diff --git a/target/linux/mediatek/mt7986/config-5.4 b/target/linux/mediatek/mt7986/config-5.4
index 2622dbe..9e6c54c 100644
--- a/target/linux/mediatek/mt7986/config-5.4
+++ b/target/linux/mediatek/mt7986/config-5.4
@@ -248,6 +248,11 @@
 CONFIG_ILLEGAL_POINTER_VALUE=0xdead000000000000
 CONFIG_INITRAMFS_SOURCE=""
 CONFIG_IO_URING=y
+CONFIG_IP_NF_FILTER=m
+CONFIG_IP_NF_IPTABLES=m
+CONFIG_IP_NF_MANGLE=m
+CONFIG_IP_NF_NAT=m
+CONFIG_IP_NF_TARGET_MASQUERADE=m
 CONFIG_IRQCHIP=y
 CONFIG_IRQ_DOMAIN=y
 CONFIG_IRQ_DOMAIN_HIERARCHY=y
@@ -304,6 +309,7 @@
 CONFIG_MUTEX_SPIN_ON_OWNER=y
 CONFIG_NEED_DMA_MAP_STATE=y
 CONFIG_NEED_SG_DMA_LENGTH=y
+CONFIG_NETFILTER=y
 CONFIG_NET_DEVLINK=y
 CONFIG_NET_DSA=y
 CONFIG_NET_DSA_MT7530=y
@@ -312,6 +318,9 @@
 CONFIG_NET_MEDIATEK_SOC=y
 CONFIG_NET_SWITCHDEV=y
 CONFIG_NET_VENDOR_MEDIATEK=y
+CONFIG_NF_CONNTRACK=y
+CONFIG_NF_CONNTRACK_IPV4=m
+CONFIG_NF_CONNTRACK_IPV6=m
 CONFIG_NLS=y
 CONFIG_NMBM=y
 # CONFIG_NMBM_LOG_LEVEL_DEBUG is not set