gpu: nova-core: fix incorrect naming/framing of GSP-FMC firmware

The GSP-FMC firmware code lived in `firmware/fsp.rs` and described
itself as running on the FSP. This is incorrect: GSP-FMC is loaded by
the FSP, but runs on the GSP as the loader and verifier of GSP-RM. FSP
secure-boots on its own before the driver even starts.

Correct the naming and location of the GSP-FMC code by:

- Renaming `firmware/fsp.rs` to `firmware/gsp_fmc.rs` (as GSP-FMC is not
  the FSP firmware),
- Changing the prefix of some declarations in that file to `FMC` or
  `GspFmc` (interestingly some were already correct),
- Rewording the `fsp.rs` module documentation to describe the actual
  boot flow.

Reviewed-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Link: https://patch.msgid.link/20260825-gsp-fmc-rename-v1-1-f82526f01d7d@nvidia.com
[acourbot: drop the documentation change to be picked up by Zhi, reword
 commit message a bit.]
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

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