Merge branch 'devlink-register'

Leon Romanovsky says:

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Remove duplicated devlink registration check

Changelog:
v1:
 * Added two new patches that remove registration field from mlx5 and ti drivers.
v0: https://lore.kernel.org/lkml/ed7bbb1e4c51dd58e6035a058e93d16f883b09ce.1627215829.git.leonro@nvidia.com

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Both registered flag and devlink pointer are set at the same time
and indicate the same thing - devlink/devlink_port are ready. Instead
of checking ->registered use devlink pointer as an indication.
====================

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