Merge branch 'devlink-const'

Christophe JAILLET says:

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devlink: Constify struct devlink_dpipe_table_ops

Patch 1 updates devl_dpipe_table_register() and struct
devlink_dpipe_table to accept "const struct devlink_dpipe_table_ops".

Then patch 2 updates the only user of this function.

This is compile tested only.
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Signed-off-by: David S. Miller <davem@davemloft.net>