gpu: nova-core: Hopper: use correct sysmem flush registers

Hopper has its own FBHUB sysmem flush page registers, but the Hopper
framebuffer HAL delegates to the Ampere NISO path, which encodes the
address with an 8-bit right-shift. That programs the wrong value into
the wrong registers, so the GPU's sysmembar flush targets the wrong
system memory address.

Add Hopper's FBHUB flush registers and program them directly from the
Hopper HAL.

This has not yet been tested on real Hopper hardware (that's true for
nova-core in general).

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Link: https://patch.msgid.link/20260611011901.84517-3-jhubbard@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

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