net/phy: micrel: Comment MMD address of extended registers

There are some defines for a few pad skew related extended registers.
Specify for which MMD Address (dev_addr) they are for.

Signed-off-by: Jaeden Amero <jaeden.amero@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed