memory: delete struct AddressSpaceOps

Since struct AddressSpaceOps isn't used anywhere else,
so just delete it.
Signed-off-by: NJay Zhou <jianjay.zhou@huawei.com>
Message-Id: <1526384108-49348-1-git-send-email-jianjay.zhou@huawei.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

memory.c

@@ -219,8 +219,6 @@ struct FlatRange {
     bool readonly;
 };
 
-typedef struct AddressSpaceOps AddressSpaceOps;
-
 #define FOR_EACH_FLAT_RANGE(var, view)          \
     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)