The current dts file of dgs-1210-10p doesn't support link states
for the sfp ports (they are always up).
This patch tries to give better support for this and was run tested
on dgs-1210-10p.
It was already commited to the main branch.
Signed-off-by: Michel Thill <jmthill@gmail.com>
(cherry picked from commit 135e107620)