types/dnstype: delete unused func, move other one to its sole caller

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The dnstype package is used by tailcfg, which tries to be light and
leafy. But it brings in dnstype. So dnstype shouldn't bring in
x/net/dns/dnsmessage.

Updates #12614

Change-Id: I043637a7ce7fed097e648001f13ca1927a781def
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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