Merge branch 'bareudp-remove-unused'

Guillaume Nault says:

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bareudp: Remove unused code from header file

Stop exporting unused functions and structures in bareudp.h. The only
piece of bareudp.h that is actually used is netif_is_bareudp(). The
rest can be moved to bareudp.c or even dropped entirely.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>