amd-xgbe: Update connection validation for backplane mode

Update the connection type enumeration for backplane mode and return
an error when there is a mismatch between the mode and the connection
type.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed