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Allow both indices and keys to exist for objects in pools.  Previously you
were limited to one or the other.

This is required for later implementing rxe memory windows.

Link: https://lore.kernel.org/r/20201216231550.27224-3-rpearson@hpe.com

Signed-off-by: Bob Pearson <rpearson@hpe.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>