1.4.1 PF_XCVR: Disable Scrambler in 64b66b

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The Libero SoC v2025.1 release includes updates to support additional configurations for 64b6xb PCS mode. The new Gear Box option allows users to independently enable the following options for 64B66B / 64B67B modes:

Scrambler/descrambler: This option can include or bypass the embedded scrambled/descrambler.
Disparity (64b67b only)
BER monitor state machine
32-bit data width

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