[][MAC80211][hnat][Fix PPE entry clear issue]

[Description]
Fix PPE entry clear issue.

PPE has a cache memory, user has to clear the cache as well
when setting the PPE entry to INVALD state.

If without this patch, PPE might not unbind PPE entry immediately.

[Release-log]
N/A


Change-Id: If844b66f25c6563ea8cccdbc7e0633939dd78eaf
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7202138
diff --git a/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/9993-add-wed.patch b/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/9993-add-wed.patch
index baa88ef..b4f8e4e 100755
--- a/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/9993-add-wed.patch
+++ b/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/9993-add-wed.patch
@@ -654,7 +654,7 @@
  		entry->ipv6.ib2 = val;
  		l2 = &entry->ipv6.l2;
  	} else {
-@@ -329,32 +351,167 @@ int mtk_foe_entry_set_pppoe(struct mtk_foe_entry *entry, int sid)
+@@ -329,32 +351,168 @@ int mtk_foe_entry_set_pppoe(struct mtk_foe_entry *entry, int sid)
  	return 0;
  }
  
@@ -723,6 +723,7 @@
 +		ppe->foe_table[entry->hash].ib1 |= FIELD_PREP(MTK_FOE_IB1_STATE,
 +							      MTK_FOE_STATE_INVALID);
 +		dma_wmb();
++		mtk_ppe_cache_clear(ppe);
 +	}
 +	entry->hash = 0xffff;
 +