phy: lynx-28g: cancel the CDR check work item on the remove path

commit  fc32b4c550fc265e6d7efd1ace2ed7759fe3ff38 from
https://github.com/nxp-imx/linux-imx

 lf-6.1.y

The blamed commit added the CDR check work item but didn't cancel it on
the remove path. Fix this by adding a remove function which takes care
of it.

Fixes: 8f73b37c ("phy: add support for the Layerscape SerDes 28G")
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit f200bab3)
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>