Put keystore into the drmrpc group

The keystore service needs to access hardware crypto devices to
fulfill its function on devices with hardware crypto. This role
was assigned to the (now misnamed) drmrpc group.

Change-Id: Ia32f9e96b4372f0974984451680f9a0f6157aa01
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 2e8f7d2..9a5bddf 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -483,7 +483,7 @@
 service keystore /system/bin/keystore /data/misc/keystore
     class main
     user keystore
-    group keystore
+    group keystore drmrpc
     socket keystore stream 666
 
 service dumpstate /system/bin/dumpstate -s