Add laser enabling code.

- Change pon type to PON_NONE in board config since WDMPON is P2P PON.
- If the driver mode is not changed, return OK in IOCTL handler.
- Add code to enable TX laser. We use BOARD_GPP_PON_XVR_TX which is
  currently not used for the chip 88F6601 A0.

Change-Id: Idcc35bb25bf41c8677984b227e5b937979edf10e
7 files changed