drm/nouveau/bios: specify correct display fuse register for Ampere and Ada

drm/nouveau/bios: specify correct display fuse register for Ampere and Ada

The NV_FUSE_STATUS_OPT_DISPLAY register is used to determine whether
the GPU has display hardware.  The current code that normally reads
this register is instead hard-coded to check for GA100 vs later GPUs.
Since this function is called only on pre-Hopper GPUs, and this
if-statement applies only to GA100 and later, the check works
because GA100 is the only non-display Ampere and Ada GPU.

However, there actually is a register that can be read, so we should
use it.

Fixes: a34632482f1e ("drm/nouveau/bios/ga10[024]: initial support")
Signed-off-by: Timur Tabi <ttabi@nvidia.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patch.msgid.link/20260430223838.2530778-8-ttabi@nvidia.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>