Documentation: networking: update phy.txt with recent changes

The PHY library was missing a bunch of newly added PHY driver callbacks
along with a smallish description of what they do, fix that.
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Documentation/networking/phy.txt

@@ -253,16 +253,25 @@ Writing a PHY driver
 
  Each driver consists of a number of function pointers:
 
+   soft_reset: perform a PHY software reset
    config_init: configures PHY into a sane state after a reset.
      For instance, a Davicom PHY requires descrambling disabled.
    probe: Allocate phy->priv, optionally refuse to bind.
    PHY may not have been reset or had fixups run yet.
    suspend/resume: power management
    config_aneg: Changes the speed/duplex/negotiation settings
+   aneg_done: Determines the auto-negotiation result
    read_status: Reads the current speed/duplex/negotiation settings
    ack_interrupt: Clear a pending interrupt
+   did_interrupt: Checks if the PHY generated an interrupt
    config_intr: Enable or disable interrupts
    remove: Does any driver take-down
+   ts_info: Queries about the HW timestamping status
+   hwtstamp: Set the PHY HW timestamping configuration
+   rxtstamp: Requests a receive timestamp at the PHY level for a 'skb'
+   txtsamp: Requests a transmit timestamp at the PHY level for a 'skb'
+   set_wol: Enable Wake-on-LAN at the PHY level
+   get_wol: Get the Wake-on-LAN status at the PHY level
 
  Of these, only config_aneg and read_status are required to be
  assigned by the driver code.  The rest are optional.  Also, it is