Adds new documentation for MLX5 common driver that contains:
- Its features list (doesn't exist for now).
- Its devargs description.
- Device configuration information and tutorial.
- Quick Start Guide for Mellanox OFED/EN.
Move into this doc all shared information from other MLX5 PMD docs and
add them reference to new common doc.
Signed-off-by: Michael Baum <michaelba@nvidia.com>
Reviewed-by: Raslan Darawsheh <rasland@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
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