Add missing const attributes for MemoryRegionOps

Most MemoryRegionOps already had the const attribute.
This patch adds it to the remaining ones.

Signed-off-by: Stefan Weil <[email protected]>
Signed-off-by: Blue Swirl <[email protected]>
diff --git a/hw/cuda.c b/hw/cuda.c
index 4077436..233ab66 100644
--- a/hw/cuda.c
+++ b/hw/cuda.c
@@ -634,7 +634,7 @@
     return 0;
 }
 
-static MemoryRegionOps cuda_ops = {
+static const MemoryRegionOps cuda_ops = {
     .old_mmio = {
         .write = {
             cuda_writeb,