sunxi-hci: Simplify and add comments to USBC_Phy_Write

Signed-off-by: Arokux <arokux@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sunxi-hci: Use read*/write* instead of no-op defines

Signed-off-by: Arokux <arokux@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sunxi-hci: Move GPIO init code to the common place

Signed-off-by: Arokux <arokux@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>