net: ravb: Simplify poll & receive functions

We don't need to pass the work budget to ravb_rx() by reference, it's
cleaner to pass this by value and return the amount of work done. This
allows us to simplify the ravb_poll() function and use the common
`work_done` variable name seen in other network drivers for consistency
and ease of understanding.

This is a pure refactor and should not affect behaviour.

Signed-off-by: Paul Barker <[email protected]>
Reviewed-by: Sergey Shtylyov <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

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