diag: Dont leave /dev/diag as world read/write

ueventd.rc defaults /dev/diag to radio:radio group only.
Remove override from ueventd.mako.rc for this device node as
the default permissions are safer.

Bug: 6933652
Change-Id: I6c21b9aeb185f748f151b5fb85d8f6493d0bc067

Conflicts:
	ueventd.mako.rc
diff --git a/ueventd.mako.rc b/ueventd.mako.rc
index ad69eae..dd5da1f 100644
--- a/ueventd.mako.rc
+++ b/ueventd.mako.rc
@@ -37,7 +37,6 @@
 /dev/msm_dsps             0600   system     system
 /dev/bcm2079x-i2c         0660   nfc        nfc
 /dev/qseecom              0660   system     drmrpc
-/dev/diag                 0666   root       root
 /dev/mdm                  0660   system     radio
 /dev/ttyUSB0              0660   system     system
 /dev/block/mmcblk0p8      0660   system     system