net: mdio: fix typo in header

The quotes symbol in
  "EEE "link partner ability 1
should be at the end of the register name
  "EEE link partner ability 1"

Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>