kernel: remove udp tunnel kconfig selection hack

The corresponding kmod package is marked as HIDDEN and selected by all
other kernel modules that need it, so the kconfig side will be in sync
without manual selection

Signed-off-by: Felix Fietkau <nbd@nbd.name>

target/linux/generic/hack-5.10/249-udp-tunnel-selection.patch

@@ -1,11 +0,0 @@
---- a/net/ipv4/Kconfig
-+++ b/net/ipv4/Kconfig
-@@ -315,7 +315,7 @@ config NET_IPVTI
- 	  on top.
- 
- config NET_UDP_TUNNEL
--	tristate
-+	tristate "IP: UDP tunneling support"
- 	select NET_IP_TUNNEL
- 	default n
- 

target/linux/generic/hack-5.15/249-udp-tunnel-selection.patch

@@ -1,20 +0,0 @@
-From 4487708144118bfd5e1b1da7003a486951fb9c5a Mon Sep 17 00:00:00 2001
-From: OpenWrt community <openwrt-devel@lists.openwrt.org>
-Date: Wed, 13 Jul 2022 13:31:51 +0200
-Subject: [PATCH] net/ipv4: add udp tunnel tristate string
-
----
- net/ipv4/Kconfig | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
---- a/net/ipv4/Kconfig
-+++ b/net/ipv4/Kconfig
-@@ -315,7 +315,7 @@ config NET_IPVTI
- 	  on top.
- 
- config NET_UDP_TUNNEL
--	tristate
-+	tristate "IP: UDP tunneling support"
- 	select NET_IP_TUNNEL
- 	default n
-