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The first patch in a series to split UMR logic to a dedicated file.  As a
start, move the init and cleanup of UMR resources to umr.c.

Link: https://lore.kernel.org/r/849e632dd1945a2534712a320cc5779f2149ba96.1649747695.git.leonro@nvidia.com

Signed-off-by: Aharon Landau <aharonl@nvidia.com>
Reviewed-by: Michael Guralnik <michaelgur@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>