Merge branch 'xgene'

Merge branch 'xgene'

Iyappan Subramanian says:

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Adding SGMII based 1GbE basic support to APM X-Gene SoC ethernet driver.

v2: Address comments from v1
* Split the patchset into two, the first one being preparatory patch
* Added link_state function pointer to the xgene_mac_ops structure
* Added xgene_indirect_ctl structure for indirect read/write arguments

v1:
* Initial version
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Signed-off-by: David S. Miller <davem@davemloft.net>