[sff8436] Fix TXPower params offset

[mad4321]

Description

The TX power values for QSFP+ sff8436 are shown the same as RX.

show int transceiver  eeprom  -d Ethernet68 | grep Power
        Extended Identifier: Power Class 4(3.5W max), CLEI present
                RX1Power: -40.0dBm
                RX2Power: -40.0dBm
                RX3Power: -2.7622dBm
                RX4Power: -40.0dBm
                TX1Power: -40.0dBm
                TX2Power: -40.0dBm
                TX3Power: -2.7622dBm
                TX4Power: -40.0dBm

Motivation and Context

It's maybe typo error, the TX offsets was the same as RX offsets.

How Has This Been Tested?

The correct values for TX and RX are shown now.

show interfaces transceiver eeprom --dom Ethernet68 | grep Power
        Extended Identifier: Power Class 4(3.5W max), CLEI present
                RX1Power: -40.0dBm
                RX2Power: -40.0dBm
                RX3Power: -2.9217dBm
                RX4Power: -40.0dBm
                TX1Power: -1.4758dBm
                TX2Power: -1.2884dBm
                TX3Power: 0.425dBm
                TX4Power: -2.5274dBm

Additional Information (Optional)