nvbios: Document INIT_VDT devinit opcode (0xAA)
nvbios: Document INIT_VDT devinit opcode (0xAA)

Set NVVDD depending on the VDT entry.

This opcode invokes the PMU to set the NVVDD (voltage for the
GPU) depending on the VDT table entry that is passed.

Source:
- https://download.nvidia.com/open-gpu-doc/Devinit/1/devinit.xml#INIT_VDT

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