bnxt_en: L2-RoCE driver communication interface

- Added Aux bus support for RoCE.
- Implemented the ulp ops that are required by RoCE driver.
- Restructure context memory data structures
- DBR pacin

bnxt_en: L2-RoCE driver communication interface

- Added Aux bus support for RoCE.
- Implemented the ulp ops that are required by RoCE driver.
- Restructure context memory data structures
- DBR pacing support

Reviewed by: imp
Approved by: imp
Differential revision: https://reviews.freebsd.org/D45006

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