hw/timer/sun4v-rtc: Fix tracing at sun4v_rtc_write()

The code was converted to use sun4v_rtc_read() by mistake, fix
it.
Reported-by: NDavid Gibson <david@gibson.dropbear.id.au>
Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Message-Id: <20181031001843.12892-1-ehabkost@redhat.com>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

hw/timer/sun4v-rtc.c

@@ -41,7 +41,7 @@ static uint64_t sun4v_rtc_read(void *opaque, hwaddr addr,
 static void sun4v_rtc_write(void *opaque, hwaddr addr,
                              uint64_t val, unsigned size)
 {
-    trace_sun4v_rtc_read(addr, val);
+    trace_sun4v_rtc_write(addr, val);
 }
 
 static const MemoryRegionOps sun4v_rtc_ops = {