cpu: Introduce cpu_resume(), for single CPU

Also add a stub for it, to make possible to use it in qom/cpu.c,
which is shared with user emulators.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/cpus.c b/cpus.c
index 5a98a37..1d88761 100644
--- a/cpus.c
+++ b/cpus.c
@@ -993,6 +993,13 @@
     }
 }
 
+void cpu_resume(CPUState *cpu)
+{
+    cpu->stop = false;
+    cpu->stopped = false;
+    qemu_cpu_kick(cpu);
+}
+
 void resume_all_vcpus(void)
 {
     CPUArchState *penv = first_cpu;
@@ -1000,9 +1007,7 @@
     qemu_clock_enable(vm_clock, true);
     while (penv) {
         CPUState *pcpu = ENV_GET_CPU(penv);
-        pcpu->stop = false;
-        pcpu->stopped = false;
-        qemu_cpu_kick(pcpu);
+        cpu_resume(pcpu);
         penv = penv->next_cpu;
     }
 }