ipa2-lite upstreaming

[barni2000]

Previously there was an effort add ipa v2 support for upstreamed ipa driver but it is not working,
but now we have a new separate driver (ipa2-lite) what is working maybe it could be upstreamed in the future.
Let's track here what is left.

Previous ticket related to mainline ipa driver: #93

TODO:

• Power management: Clock gating (need to send UC event for it)
• Power management: Dynamic clock/bw based on statistics
• Free some memory when interface is down.
• Debugging feature: Do something with packets/status from lan_rx (It has custom header) or drop it.
• Look into scatter/gather support (maybe just for TX).
• Clean up the code
• ...