Add imsdatadaemon to readproc group

imsdatadaemon needs access to /proc to find netmgr process.

Bug: 25666929
Change-Id: Ib72010ba4d1c209afe07cee46d67fd126e533aea
diff --git a/init.shamu.rc b/init.shamu.rc
index ce9a187..758889d 100644
--- a/init.shamu.rc
+++ b/init.shamu.rc
@@ -384,7 +384,7 @@
     class main
     user root
     socket ims_datad stream 0660 system radio
-    group system wifi radio inet log
+    group system wifi radio inet log readproc
     disabled
 
 on property:sys.ims.QMI_DAEMON_STATUS=1