Fix up support for the AR8327.

• Even though I got the registers around "right", it seems I'm not tickling the MDIO access correctly for the internal PHY bus. Some of the switches are fine poking at the external PHY registers; others aren't. So, enable direct PHY bus access for the AR8327, and leave the existing code in place for the others.

• Go and shuffle the register access around. Whilst here, restore the 2ms delay if changing page.

• Comment out some of the stub printf()s; there's some upcoming work to add port VLAN support.

Tested:

• AP135 development board
• Carambola2 - AR9331 SoC