gpu: nova-core: split FbLayout into FSP and non-FSP versions

`FbLayout` is currently used for both pre and post FSP architectures. It
contains ranges for each region of framebuffer, but on post FSP
architectures, only the size is actually used. The region locations are
decided by ACR, which runs as part of the GSP-FMC, not by the driver.
The driver only provides the sizes. So, for post FSP architectures
`FbLayout` contains essentially guesses for the offsets. Instead, make
separate types so that we only store the information that's actually
needed, rather than keeping around offsets that may not be correct.

Signed-off-by: Eliot Courtney <ecourtney@nvidia.com>
Link: https://patch.msgid.link/20260804-blackwell-fixes-v4-4-ac858b6a1935@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

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