spapr: Pass PowerPCCPU to spapr_hypercall()

Needed for changing the hypercall handlers' argument type to PowerPCCPU.

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/hw/spapr.h b/hw/spapr.h
index 51c709e..f11028d 100644
--- a/hw/spapr.h
+++ b/hw/spapr.h
@@ -291,7 +291,7 @@
                                        target_ulong *args);
 
 void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn);
-target_ulong spapr_hypercall(CPUPPCState *env, target_ulong opcode,
+target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong opcode,
                              target_ulong *args);
 
 int spapr_allocate_irq(int hint, bool lsi);