[][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-5.4/9999-2-flow-offload-add-mtkhnat-flow-accounting.patch b/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/9999-2-flow-offload-add-mtkhnat-flow-accounting.patch
index f6243d0..5b6253f 100644
--- a/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/9999-2-flow-offload-add-mtkhnat-flow-accounting.patch
+++ b/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/9999-2-flow-offload-add-mtkhnat-flow-accounting.patch
@@ -139,9 +139,10 @@
  static void mtk_ppe_cache_clear(struct mtk_ppe *ppe)
  {
  	ppe_set(ppe, MTK_PPE_CACHE_CTL, MTK_PPE_CACHE_CTL_CLEAR);
-@@ -412,6 +452,18 @@ __mtk_foe_entry_clear(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
+@@ -412,7 +452,19 @@ __mtk_foe_entry_clear(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
  							      MTK_FOE_STATE_INVALID);
  		dma_wmb();
+ 		mtk_ppe_cache_clear(ppe);
 +
 +		if (ppe->accounting) {
 +			struct mtk_foe_accounting *acct, *acct_updated;