change all rt_clock references to use millisecond resolution accessors

This was done with:

    sed -i '/get_clock\>.*rt_clock/s/get_clock\>/get_clock_ms/' \
        $(git grep -l 'get_clock\>.*rt_clock' )
    sed -i '/new_timer\>.*rt_clock/s/new_timer\>/new_timer_ms/' \
        $(git grep -l 'new_timer\>.*rt_clock' )

after checking that get_clock and new_timer never occur twice
on the same line.  There were no missed occurrences; however, even
if there had been, they would have been caught by the compiler.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/console.c b/console.c
index 57d6eb5..12407b3 100644
--- a/console.c
+++ b/console.c
@@ -1135,7 +1135,7 @@
     /* characters are pending: we send them a bit later (XXX:
        horrible, should change char device API) */
     if (s->out_fifo.count > 0) {
-        qemu_mod_timer(s->kbd_timer, qemu_get_clock(rt_clock) + 1);
+        qemu_mod_timer(s->kbd_timer, qemu_get_clock_ms(rt_clock) + 1);
     }
 }
 
@@ -1457,7 +1457,7 @@
 
     s->out_fifo.buf = s->out_fifo_buf;
     s->out_fifo.buf_size = sizeof(s->out_fifo_buf);
-    s->kbd_timer = qemu_new_timer(rt_clock, kbd_send_chars, s);
+    s->kbd_timer = qemu_new_timer_ms(rt_clock, kbd_send_chars, s);
     s->ds = ds;
 
     if (!color_inited) {