powerpc/85xx: introduce function serdes_device_from_fm_port()
In order to figure out which SerDes lane a given Fman port is connected to, we need a function that maps the fm_port namespace to the srds_prtcl namespace. Signed-off-by: NTimur Tabi <timur@freescale.com> Signed-off-by: NAndy Fleming <afleming@freescale.com>
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