net/mlx5: DR, Add direct rule command utilities

Add direct rule command utilities which consists of all the FW
commands that are executed to provide the SW steering functionality.

Signed-off-by: Alex Vesker <[email protected]>
Reviewed-by: Erez Shitrit <[email protected]>
Reviewed-by: Mark Bloch <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: alexvesker