Add another hardware bug workaround for Yukon II controllers that

have hardware ram buffer. The silicon bug seem to be triggered by
pause frames if receive buffer is not aligned on FIFO word(8 bytes).
To workaround the issue, make sure to align Rx buffers on 8 bytes.
Unfortunately this workaround requires yet another Rx fixup for
strict alignment architecture machines to align IP header.

For newer hardwares that lacks ram buffer may not have this bug so
check number of available ram buffer size to see the existence of
ram buffer.

Reported by:	Ian Freislich (ianf <at> clue dot co dot za), das
Tested by:	Ian Freislich (ianf <at> clue dot co dot za)

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