driver: ldpaa: Add api to return linked PHY ID of DPMAC
DPMAC represents physical line on the board. This physical line eventually asscociate with on-board PHY. So Add an api to return linked PHY ID of DPMAC object. Signed-off-by: NPrabhakar Kushwaha <prabhakar@freescale.com> Reviewed-by: NYork Sun <yorksun@freescale.com>
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