spapr: Fix typo in the patb_entry comment

There is no H_REGISTER_PROCESS_TABLE, it is H_REGISTER_PROC_TBL handler
for which is still called h_register_process_table() though.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <20210225032335.64245-1-aik@ozlabs.ru>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Author: aik

include/hw/ppc/spapr.h

@@ -168,7 +168,7 @@ struct SpaprMachineState {
     SpaprResizeHpt resize_hpt;
     void *htab;
     uint32_t htab_shift;
-    uint64_t patb_entry; /* Process tbl registed in H_REGISTER_PROCESS_TABLE */
+    uint64_t patb_entry; /* Process tbl registed in H_REGISTER_PROC_TBL */
     SpaprPendingHpt *pending_hpt; /* in-progress resize */
 
     hwaddr rma_size;