gpu: nova-core: extract radix3 page table into its own module

In order to boot the GSP, nova-core loads the GSP firmware image into
system memory, and the GPU copies it into the framebuffer, the GPU's own
memory. The GPU finds the GSP firmware image's pages via "radix3", a
three-level page table of 4 KiB pages that the driver builds. Today the
table exists as fields within the GSP firmware wrapper, which is fine
because there is only one radix3 consumer.

The upcoming r000 series[1], however, introduces a second radix3 caller:
the ucodes firmware image. That is because the GSP has been changed, so
that it automatically fetches the subset of ucodes that it requires,
thus reducing the size of the GSP image. This is a helpful change for
the firmware situation overall, but it will require nova-core to load
and provide ucodes, in much the same way that it was loading and
providing the GSP firmware image.

Therefore, split out radix3 into its own module.

[1] https://lore.kernel.org/all/20260822015448.238214-1-jhubbard@nvidia.com/

[acourbot: keep only the mechanical move, split other changes into
 distinct commits]

Assisted-by: LLM
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Timur Tabi <ttabi@nvidia.com>
Link: https://patch.msgid.link/20260913195413.742143-2-jhubbard@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

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