timer.h: Provide better monotonic time

Tested and confirmed that the stretch i386 debian qcow2 image on a
raspberry pi 2 works.

Fixes: LP#: 893208 <https://bugs.launchpad.net/qemu/+bug/893208/>
Signed-off-by: NPranith Kumar <bobby.prani@gmail.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Message-id: 20170418191817.10430-1-bobby.prani@gmail.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

include/qemu/timer.h

@@ -1020,10 +1020,9 @@ static inline int64_t cpu_get_host_ticks(void)
 /* The host CPU doesn't have an easily accessible cycle counter.
    Just return a monotonically increasing value.  This will be
    totally wrong, but hopefully better than nothing.  */
-static inline int64_t cpu_get_host_ticks (void)
+static inline int64_t cpu_get_host_ticks(void)
 {
-    static int64_t ticks = 0;
-    return ticks++;
+    return get_clock();
 }
 #endif