cpu: Turn cpu_dump_{state,statistics}() into CPUState hooks

Make cpustats monitor command available unconditionally.

Prepares for changing kvm_handle_internal_error() and kvm_cpu_exec()
arguments to CPUState.

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
index 23fe51f..8ec2f9b 100644
--- a/target-s390x/cpu.c
+++ b/target-s390x/cpu.c
@@ -170,6 +170,7 @@
     cc->reset = s390_cpu_reset;
 
     cc->do_interrupt = s390_cpu_do_interrupt;
+    cc->dump_state = s390_cpu_dump_state;
     dc->vmsd = &vmstate_s390_cpu;
 }