drm/nouveau: remove unused param repc in *rm_alloc_push()

The user of *rm_alloc_push() always pass 0 in repc.

Remove unused param repc since no user actually uses it.

No functional change is intended.

Signed-off-by: Zhi Wang <zhiw@nvidia.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250124182958.2040494-5-zhiw@nvidia.com