Allow atrace hal tracefs access

Add atrace hal to the readtracefs group

Bug: 214591300
Test: adb shell perfetto (Use config with atrace_categories)
Change-Id: Id9e06f88539b59480d5cf57a4ba67cef4676c1d5
Merged-In: Id9e06f88539b59480d5cf57a4ba67cef4676c1d5
diff --git a/atrace/1.0/default/android.hardware.atrace@1.0-service.rc b/atrace/1.0/default/android.hardware.atrace@1.0-service.rc
index 7110b45..31459b4 100644
--- a/atrace/1.0/default/android.hardware.atrace@1.0-service.rc
+++ b/atrace/1.0/default/android.hardware.atrace@1.0-service.rc
@@ -14,4 +14,4 @@
     interface android.hardware.atrace@1.0::IAtraceDevice default
     class early_hal
     user system
-    group system
+    group system readtracefs