Merge branch 'xgene-net'

Iyappan Subramanian says:

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drivers: net: xgene: Fix crash for backward compatibility

This patch set fixes the following issues that were reported during regression.

Patch 1,2 : Adds backward compatibility with the older firmware (<= 1.13.28).
Patch 3   : Use separate hardware resources (descriptor ring, prefetch buffer)
	   that are not shared with the firmware
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Signed-off-by: David S. Miller <davem@davemloft.net>