Add SD-FEC driver documentation.
Signed-off-by: NDerek Kiernan <derek.kiernan@xilinx.com>
Signed-off-by: NDragan Cvetic <dragan.cvetic@xilinx.com>
Link: https://lore.kernel.org/r/1564216438-322406-8-git-send-email-dragan.cvetic@xilinx.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>