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>
diff --git a/hw/syborg_rtc.c b/hw/syborg_rtc.c
index 329aa42..16d8f9e 100644
--- a/hw/syborg_rtc.c
+++ b/hw/syborg_rtc.c
@@ -66,7 +66,7 @@
     offset &= 0xfff;
     switch (offset >> 2) {
     case RTC_LATCH:
-        now = qemu_get_clock(vm_clock);
+        now = qemu_get_clock_ns(vm_clock);
         if (value >= 4) {
             s->offset = s->data - now;
         } else {