[RFC v3 1/3] eal/lcore: add topology based functions

[Varghese, Vipin]

Snipped

> 
> Does the API need to be prepared for L4 cache?
> https://www.anandtech.com/show/16924/did-ibm-just-preview-the-future-of-caches
Thank you for the pointer, yes initial patch was considering L4 cache too. But I was not able to get hold of system or get someone to test this with L4.
Hence removed the L4 instance from dpdk_topology structure.

We can introduce into v4. Can we get someone from IBM to confirm the same?

> 
> And - just a thought:
> Since this library and the Cache Stashing (PCIe TLP) library are somewhat related,
> would it be beneficial to combine them into one patch series, primarily to make their
> APIs more uniform?

There was initial zoom invite for understanding and usage, we expected a follow up on the same to close the loop.
Based on my current understanding, the API to be used as hints to PMD should be passing `lcore id` only.
Hence these can be independent.