net: dsa: mv88e6xxx: enable SerDes PCS register dump via ethtool -d on Topaz

net: dsa: mv88e6xxx: enable SerDes PCS register dump via ethtool -d on Topaz

BugLink: https://bugs.launchpad.net/bugs/1940468
commit 953b0dcbe2e3f7bee98cc3bca2ec82c8298e9c16 upstream.

Commit bf3504cea7d7e ("net: dsa: mv88e6xxx: Add 6390 family PCS
registers to ethtool -d") added support for dumping SerDes PCS registers
via ethtool -d for Peridot.

The same implementation is also valid for Topaz, but was not
enabled at the time.

Signed-off-by: Marek Behún <kabel@kernel.org>
Fixes: bf3504cea7d7e ("net: dsa: mv88e6xxx: Add 6390 family PCS registers to ethtool -d")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>