gpu: nova-core: add KUnit tests for the interrupt tree

The vector arithmetic and the leaf and subtree sets touch no hardware,
so KUnit can cover them without a GPU. A wrong leaf, bit or subtree for
a vector would otherwise show up only as a lost interrupt on hardware.

Add the nova_core_gin_tree suite. It checks that a leaf index stops at
the widest supported tree, that a leaf count implies the right number of
subtrees and vectors, that a leaf count enumerates every leaf in order,
that a vector maps to the right leaf, bit and subtree, and that a vector
beyond an 8-leaf tree is rejected there and accepted in a 16-leaf tree.
It also exercises the subtree set operations and checks that every
supported chipset implements the subtree that carries the GSP event.

Assisted-by: LLM
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patch.msgid.link/20260930034148.590687-15-jhubbard@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

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