memory: Simplify mr_add_subregion() if-else

This if else is not needed. The previous call to memory_region_add
(whether _overlap or not) will always set priority and may_overlap
to desired values. And its not possible to get here without having
called memory_region_add_subregion due to the null guard on parent.
So we can just directly call memory_region_add_subregion_common.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

memory.c

@@ -1514,8 +1514,6 @@ void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
 void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
 {
     MemoryRegion *parent = mr->parent;
-    int priority = mr->priority;
-    bool may_overlap = mr->may_overlap;
 
     if (addr == mr->addr || !parent) {
         mr->addr = addr;
@@ -1525,11 +1523,7 @@ void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
     memory_region_transaction_begin();
     memory_region_ref(mr);
     memory_region_del_subregion(parent, mr);
-    if (may_overlap) {
-        memory_region_add_subregion_overlap(parent, addr, mr, priority);
-    } else {
-        memory_region_add_subregion(parent, addr, mr);
-    }
+    memory_region_add_subregion_common(parent, addr, mr);
     memory_region_unref(mr);
     memory_region_transaction_commit();
 }