drm/nouveau/pmu/gk107: enable PGOB codepaths

Reported to be needed as per fdo#70354 comment #61.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

@@ -1744,7 +1744,7 @@ nve7_chipset = {
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
 	.pci = g94_pci_new,
-	.pmu = gf119_pmu_new,
+	.pmu = gk104_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
 	.volt = gk104_volt_new,