target-ppc: Rework storage of VPA registration state

We change the storage of the VPA information to explicitly use fixed
size integer types which will make life easier for syncing this data with
KVM, which we will need in future.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[agraf: fix commit message]
Signed-off-by: Alexander Graf <agraf@suse.de>

target-ppc/cpu.h

@@ -1045,9 +1045,9 @@ struct CPUPPCState {
 #endif
 
 #if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY)
-    hwaddr vpa_addr;
-    hwaddr slb_shadow_addr, slb_shadow_size;
-    hwaddr dtl_addr, dtl_size;
+    uint64_t vpa_addr;
+    uint64_t slb_shadow_addr, slb_shadow_size;
+    uint64_t dtl_addr, dtl_size;
 #endif /* TARGET_PPC64 */
 
     int error_code;