net: fec: add missed clk_disable_unprepare in remove

net: fec: add missed clk_disable_unprepare in remove

BugLink: https://bugs.launchpad.net/bugs/1855787
[ Upstream commit c43eab3eddb4c6742ac20138659a9b701822b274 ]

This driver forgets to disable and unprepare clks when remove.
Add calls to clk_disable_unprepare to fix it.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>