Move common pixel atrace sepolicy to one place

Test: build and capture trace
Bug: 157908868
Change-Id: Ic46a5b2df535dfa1ffca1cc31fc6c33f52f2cafe
diff --git a/common/file_contexts b/common/file_contexts
index 738583d..0adc634 100644
--- a/common/file_contexts
+++ b/common/file_contexts
@@ -5,3 +5,6 @@
 /vendor/bin/awk                                     u:object_r:vendor_toolbox_exec:s0
 /vendor/bin/cp                                      u:object_r:vendor_toolbox_exec:s0
 /vendor/bin/toolbox_vendor                          u:object_r:vendor_toolbox_exec:s0
+
+/vendor/bin/hw/android\.hardware\.atrace@1\.0-service.pixel                           u:object_r:hal_atrace_default_exec:s0
+