RDMA/umem: Allow including ib_umem header from any location

RDMA/umem: Allow including ib_umem header from any location

Including ib_umem.h currently triggers circular dependency errors.
These issues can be resolved by removing the include of ib_verbs.h,
which was only needed to resolve the struct ib_device pointer.

>> depmod: ERROR: Cycle detected: ib_core -> ib_uverbs -> ib_core
>> depmod: ERROR: Found 2 modules in dependency cycles!
  make[3]: *** [scripts/Makefile.modinst:132: depmod] Error 1
  make[3]: Target '__modinst' not remade because of errors.
  make[2]: *** [Makefile:1960: modules_install] Error 2
  make[1]: *** [Makefile:248: __sub-make] Error 2
  make[1]: Target 'modules_install' not remade because of errors.
  make: *** [Makefile:248: __sub-make] Error 2
  make: Target 'modules_install' not remade because of errors.

Link: https://patch.msgid.link/20260213-refactor-umem-v1-2-f3be85847922@nvidia.com
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>