Update fence event path for kernel 4.10+

The sysfs path for controlling dma fence events changed yet again in
Linux 4.10, see kernel commit f54d1867005c3.

Test: adb shell atrace --list_categories | grep sync
Change-Id: Id6332f794ee4e350c936e1e777e9d94fc7cd6d11
diff --git a/private/genfs_contexts b/private/genfs_contexts
index 11edf66..8700dc0 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -218,6 +218,7 @@
 genfscon tracefs /events/lowmemorykiller/                                u:object_r:debugfs_tracing:s0
 genfscon tracefs /events/sync/                                           u:object_r:debugfs_tracing:s0
 genfscon tracefs /events/fence/                                          u:object_r:debugfs_tracing:s0
+genfscon tracefs /events/dma_fence/                                      u:object_r:debugfs_tracing:s0
 genfscon tracefs /events/filemap/mm_filemap_add_to_page_cache/           u:object_r:debugfs_tracing:s0
 genfscon tracefs /events/filemap/mm_filemap_delete_from_page_cache/      u:object_r:debugfs_tracing:s0
 genfscon tracefs /events/kmem/rss_stat/                                  u:object_r:debugfs_tracing:s0
@@ -258,6 +259,7 @@
 genfscon debugfs /tracing/events/lowmemorykiller/                                u:object_r:debugfs_tracing:s0
 genfscon debugfs /tracing/events/sync/                                           u:object_r:debugfs_tracing:s0
 genfscon debugfs /tracing/events/fence/                                          u:object_r:debugfs_tracing:s0
+genfscon debugfs /tracing/events/dma_fence/                                      u:object_r:debugfs_tracing:s0
 genfscon debugfs /tracing/events/filemap/mm_filemap_add_to_page_cache/           u:object_r:debugfs_tracing:s0
 genfscon debugfs /tracing/events/filemap/mm_filemap_delete_from_page_cache/      u:object_r:debugfs_tracing:s0
 genfscon debugfs /events/kmem/rss_stat/                                          u:object_r:debugfs_tracing:s0