Enable transceiver signal detect.

MPP 29 is hooked to optical module PIN 8. MPP 29 is used to notify the
chip that the transceiver received laser signal. However, PIN 8 of
optical module indicates the loss of laser signal. This CL basically
update the driver to reverse the detected signal for PRISM board.

Change-Id: I3c84436aa4ad73fad062bef50923e338b8d541a6
2 files changed