Platforms integrating the Mobiveil GPEX can implement a specific
mechanism to check the link status.

Add a callback to enable platform specific link status functions.
Signed-off-by: NHou Zhiqiang <Zhiqiang.Hou@nxp.com>
[lorenzo.pieralisi@arm.com: updated log]
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: NAndrew Murray <andrew.murray@arm.com>