A previous patch inadvertently deleted a declaration in the
amd_xgbe_an_tx_training function causing the build to fail.

Add the declaration for 'priv' back to the function.
Signed-off-by: NTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>