RDMA/mana_ib: Create and destroy rnic adapter

Add functions for RNIC creation and destruction.
If creation fails, the ib_probe fails as well.

Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Link: https://lore.kernel.org/r/1712738551-22075-3-git-send-email-kotaranov@linux.microsoft.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>