drm/nouveau/sec2/gv100-: add missing MODULE_FIRMWARE()

ASB was failing to load on Turing GPUs when firmware is being loaded
from initramfs, leaving the GPU in an odd state and causing suspend/
resume to fail.

Add missing MODULE_FIRMWARE() lines for initramfs generators.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: <stable@vger.kernel.org> # 5.6