drbd: remove macros using require_context

This require_context attribute originated in a proposed sparse patch by
Philipp Reisner back in 2008. Johannes Berg had a different solution to
a similar problem, and that patch "won" in the end; so the require_context
thing never got merged. The whole history can be read at [0].

DRBD kept using these annotations anyway for a while. Nowadays, on a
modern unmodified sparse, they obviously do nothing, and they are hardly
used anymore anyway.

So, just remove the definitions of these macros.

[0] https://www.spinics.net/lists/linux-sparse/msg01150.html

Signed-off-by: Christoph Böhmwalder <[email protected]>
Reviewed-by: Joel Colledge <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

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