change all other clock references to use nanosecond resolution accessors

This was done with:

    sed -i 's/qemu_get_clock\>/qemu_get_clock_ns/' \
        $(git grep -l 'qemu_get_clock\>' )
    sed -i 's/qemu_new_timer\>/qemu_new_timer_ns/' \
        $(git grep -l 'qemu_new_timer\>' )

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.

There was exactly one false positive in qemu_run_timers:

     -    current_time = qemu_get_clock (clock);
     +    current_time = qemu_get_clock_ns (clock);

which is of course not in this patch.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/adlib.c

@@ -166,7 +166,7 @@ static void timer_handler (int c, double interval_Sec)
     s->ticking[n] = 1;
 #ifdef DEBUG
     interval = get_ticks_per_sec() * interval_Sec;
-    exp = qemu_get_clock (vm_clock) + interval;
+    exp = qemu_get_clock_ns (vm_clock) + interval;
     s->exp[n] = exp;
 #endif