kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/hack-5.4/651-wireless_mesh_header.patch

@@ -0,0 +1,24 @@
+From 6d3bc769657b0ee7c7506dad9911111c4226a7ea Mon Sep 17 00:00:00 2001
+From: Imre Kaloz <kaloz@openwrt.org>
+Date: Fri, 7 Jul 2017 17:21:05 +0200
+Subject: mac80211: increase wireless mesh header size
+
+lede-commit 3d4466cfd8f75f717efdb1f96fdde3c70d865fc1
+Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
+---
+ include/linux/netdevice.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/include/linux/netdevice.h
++++ b/include/linux/netdevice.h
+@@ -140,8 +140,8 @@ static inline bool dev_xmit_complete(int
+ 
+ #if defined(CONFIG_HYPERV_NET)
+ # define LL_MAX_HEADER 128
+-#elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
+-# if defined(CONFIG_MAC80211_MESH)
++#elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25) || 1
++# if defined(CONFIG_MAC80211_MESH) || 1
+ #  define LL_MAX_HEADER 128
+ # else
+ #  define LL_MAX_HEADER 96