IB/core: uverbs: Do not wait for uverbs dev closure during forced system shutdown.

IB/core: uverbs: Do not wait for uverbs dev closure during forced system shutdown.

Waiting for uverbs dev file closure in the system forced shutdown [e.g
reboot -f] path locks up the reboot process forever preventing system
shutdown as application closure of this device file is very unlikely at
this time. This closure happens in orderly shutdown [e.g reboot] as
processes are sent SIGTERM.

Orabug: 24918039

Signed-off-by: Rama Nichanamatlu <rama.nichanamatlu@oracle.com>
Reviewed-by: Avinash Repaka <avinash.repaka@oracle.com>