Hardware supported interface statistics collection

[go2sh]

Is your enhancement proposal related to a problem? Please describe.
Currently all ethernet statistics are collected in software. Most of the ethernet devices have build in statistics register. This could be used to relive some of the CPU load.

Describe the solution you'd like
Add a new config option NET_STATISTICS_ETHERNET_HW_COLLECT to enable hardware statistics collection. Drivers not capable of HW collection could guard against it with a build assert. Software statistics should always be possible.

Describe alternatives you've considered
Alternatively a new capability could be added to guard statistics collection, but this would add some overhead also in the SW code path.