RDMA/efa: Remove duplicate aenq enable macro

We have the same macro in main and verbs files and we don't use the macro
in the verbs file, remove it.

Link: https://lore.kernel.org/r/20240624160918.27060-3-mrgolin@amazon.com


Reviewed-by: Yossi Leybovich <sleybo@amazon.com>
Signed-off-by: Yonatan Nachum <ynachum@amazon.com>
Signed-off-by: Michael Margolin <mrgolin@amazon.com>
Reviewed-by: Gal Pressman <gal.pressman@linux.dev>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>