POSIX: workaround for poll notification

Sensor combined topic notification wasnot working because
the calls to hrt_called() and hrt_call_after() in
ORBDevNode::appears_updated() are not working correctly.

This commit ifdefs out those calls, and the poling seems
to work correctly. This is a workaround until the issue is
resolved.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/modules/uORB/MuORB.cpp

@@ -514,6 +514,9 @@ ORBDevNode::appears_updated(SubscriberData *sd)
 			break;
 		}
 
+// FIXME - the calls to hrt_called and hrt_call_after seem not to work in the
+//         POSIX build
+#ifndef __PX4_POSIX
 		/*
 		 * If the interval timer is still running, the topic should not
 		 * appear updated, even though at this point we know that it has.
@@ -533,6 +536,7 @@ ORBDevNode::appears_updated(SubscriberData *sd)
 			       sd->update_interval,
 			       &ORBDevNode::update_deferred_trampoline,
 			       (void *)this);
+#endif
 
 		/*
 		 * Remember that we have told the subscriber that there is data.