stm32/eth: Implement zero-copy of lwIP pbufs for TX path.

This option (currently only enabled for N6) allows the TX path to hold on
to a pbuf reference while the DMA accesses the pbuf's memory directly,
instead of copying the entire pbuf data into the internal buffers.

This is necessary to achieve gigabit speeds on the N6, although actually
achieving that speed requires higher up parts of the stack to be efficient
as well.

Signed-off-by: Damien George <damien@micropython.org>

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