grant netmgrd access do diag_device on debug builds

Bug: 26990688
Change-Id: I31dad87774569d4d0c4125b1f836fe11291e4840
diff --git a/sepolicy/netmgrd.te b/sepolicy/netmgrd.te
index 7610a36..2e8e2d3 100644
--- a/sepolicy/netmgrd.te
+++ b/sepolicy/netmgrd.te
@@ -33,6 +33,7 @@
 
 userdebug_or_eng(`
     allow netmgrd shared_log_device:chr_file rw_file_perms;
+    allow netmgrd diag_device:chr_file rw_file_perms;
 ')
 
 # execute toybox/toolbox