config: change CONFIG_TUN to m

euler inclusion
category: feature
bugzilla: 12150
CVE: NA
---------------------------------------

Product has own tun driver, so tun driver
cannot be compiled into kernel. Change
CONFIG_TUN to m.

arch/arm64/configs/hulk_defconfig

@@ -2312,7 +2312,7 @@ CONFIG_NETCONSOLE=m
 CONFIG_NETCONSOLE_DYNAMIC=y
 CONFIG_NETPOLL=y
 CONFIG_NET_POLL_CONTROLLER=y
-CONFIG_TUN=y
+CONFIG_TUN=m
 CONFIG_TAP=m
 # CONFIG_TUN_VNET_CROSS_LE is not set
 CONFIG_VETH=y