[INET] Kill ip6_get_dsfield

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

This patch kills the duplicate implementation of ip6_get_dsfield in
inet_ecn.h.  It now uses ipv6_get_dsfield from dsfield.h instead.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

Cheers,
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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