PHY Mac Control Write

1. Copy maccontrol to tmp32

2. If wake_override is not zero

   1. Set bit 0x4000000 in tmp32

3. If mute_override is not zero

   1. Clear bit 0x40000 in tmp32
   2. Set bit 0x20000 in tmp32
4. Write tmp32 to the MAC CONTROL register (MMIO 0x120)