The Broadcom PHY is used in switches, so add the ID, and hook it up.

This upstreams the Linux kernel patch from the network operating system
SONiC from February 2020 [1].

[1]: https://github.com/Azure/sonic-linux-kernel/pull/122Signed-off-by: Jostar Yang <jostar_yang@accton.com>
Signed-off-by: Guohan Lu <lguohan@gmail.com>
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>