Remove readproc from light.

Test: pass
Change-Id: I4209305519976ed4d9f4ebb80e6eb4b5385f0ed5
diff --git a/light/2.0/default/android.hardware.light@2.0-service.rc b/light/2.0/default/android.hardware.light@2.0-service.rc
index 4228d95..3ba97d8 100644
--- a/light/2.0/default/android.hardware.light@2.0-service.rc
+++ b/light/2.0/default/android.hardware.light@2.0-service.rc
@@ -1,4 +1,4 @@
 service light-hal-2-0 /system/bin/hw/android.hardware.light@2.0-service
     class hal
     user system
-    group system readproc
\ No newline at end of file
+    group system
\ No newline at end of file