RDMA/mlx5: Move umr checks to umr.h

Move mlx5_ib_can_load_pas_with_umr() and mlx5_ib_can_reconfig_with_umr()
to umr.h and rename them accordingly.

Link: https://lore.kernel.org/r/1b799b0142534a63dfd5bacc5f8ad2256d7777ad.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>