rnndb/pm/clocks: Add decoding of some MEM_TIMINGS registers for NVC0.
docs: Fix some spelling and remove some trailing spaces.
nva: Clean up nva tools doc

- Sort commands by name for easier update
- Make more readable
- Remove no more existing commands
nvbios: Return an error if mem train subentries is above the limit to avoid stack corruption.
nvbios: Write missing null terminating byte.
nvbios: Check if HWEA entry length == -1.
Don't try to use bios->parts if NULL (parse_pcir function has probably failed).