cpus: consistently use QEMU_CLOCK_VIRTUAL_RT for icount_warp_rt timer

Fix mismatch between timer_new_ms and timer_mod.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/cpus.c b/cpus.c
index 2edb5cd..3a5323b 100644
--- a/cpus.c
+++ b/cpus.c
@@ -324,7 +324,7 @@
 static void icount_adjust_rt(void *opaque)
 {
     timer_mod(icount_rt_timer,
-                   qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 1000);
+              qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000);
     icount_adjust();
 }