config: change CONFIG_*TUNNEL to m again

euler inclusion
category: feature
bugzilla: 4979
CVE: NA
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Commit bf96e3f19d35("hulk_defconfig: update config based euleros's product config")
changes the configs to y, we need to change them to m again.

CONFIG_NET_IPIP
CONFIG_NET_IP_TUNNEL
CONFIG_NET_UDP_TUNNEL
CONFIG_NET_FOU
CONFIG_INET_TUNNEL
CONFIG_INET6_TUNNEL
CONFIG_IPV6_TUNNEL
CONFIG_IPV6_FOU
CONFIG_IPV6_FOU_TUNNEL
CONFIG_VXLAN

These configs are changed to m.