net/mlx5: Add create alias flow table function to ipsec roce

Implements functions which creates an alias flow table, and check
if alias flow table creation is even supported, and if successful
returns the created alias flow table object id.

This function would be used in later patches to allow jumping from
one vhca to another, in order to add support for MPV mode.

Signed-off-by: Patrisious Haddad <phaddad@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Link: https://lore.kernel.org/r/36e15ef41586f2a9aacc65b935de18391eef5607.1695296682.git.leon@kernel.org


Signed-off-by: Leon Romanovsky <leon@kernel.org>