drm/etnaviv: use memset32 to init pagetable

Now that memset32 is available, the open-coded pagetable initialization
loop can be replaced.

Signed-off-by: Lucas Stach <[e-mail]>

drivers/gpu/drm/etnaviv/etnaviv_iommu.c

···
 		return -ENOMEM;
 	}
 
-	for (i = 0; i < PT_ENTRIES; i++)
-		etnaviv_domain->pgtable_cpu[i] =
-				etnaviv_domain->base.bad_page_dma;
+	memset32(etnaviv_domain->pgtable_cpu, etnaviv_domain->base.bad_page_dma,
+		 PT_ENTRIES);
 
 	return 0;
 }