Add ust generated files to .gitignore

Signed-off-by: Mohamad Gebai <mohamad.gebai@polymtl.ca>
Reviewed-by: Alex Bennée <alex@bennee.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

.gitignore

@@ -10,6 +10,8 @@
 /trace/generated-tracers.dtrace
 /trace/generated-events.h
 /trace/generated-events.c
+/trace/generated-ust-provider.h
+/trace/generated-ust.c
 /libcacard/trace/generated-tracers.c
 *-timestamp
 /*-softmmu